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Status: Legacy / discontinued
An 8-bay desktop NAS that moved the line to AMD Ryzen, aimed at power users, creators and small businesses. ECC memory goes up to 32 GB, two M.2 NVMe slots add SSD caching or fast storage, and you can expand well beyond the 8 bays later. A strong pick if you expect your storage to keep growing.
| Series | x21 Series |
|---|---|
| Bays | 8 |
| CPU | AMD Ryzen V1500B |
| Cores / Threads | 4 / 8 |
| RAM | 4 GB |
| CPU architecture | x86_64 |
| Support tier | full |
| Warranty (years) | 3 |
| Release year | 2020 |
| RAID levels | Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, SHR, SHR-2 |
| PCIe slot types | 1x PCIe Gen 3 x8 |
| RAM (max) | 32 GB |
| Memory slots | 2 |
| Memory generation | DDR4 |
| ECC memory | Supported |
| Memory module type | SODIMM |
| Replaceable memory | Replaceable |
| Network ports | 4x 1GbE |
| USB ports | 4x USB 3.2 Gen 1 |
| PCIe expansion | 1 |
| M.2 slots | 2 |
| Drive bay types | 3.5" SATA HDD, 2.5" SATA HDD, 2.5" SATA SSD, M.2 NVMe SSD |
| Hot-swappable bays | Yes |
| CPU frequency (GHz) | 2.2 |
| Power supply (W) | 250 |
| Weight | 13.2 lb (6 kg) |
| Largest certified configuration observed | 192 TB (8 x Synology HAT5320-24T, largest drive on the vendor HCL today; not a hardware limit) |
| Estimated cost to fill every bay with a certified 8 TB drive | about $2,400 new (Western Digital WD80EFPX) / about $2,520 refurbished (Seagate ST8000NE001) / about $1,031 used (Western Digital WD82PURZ) -- one observed eBay unit price incl. shipping x bays; quantity availability unverified |
| Estimated cost to fill every bay with a certified 16 TB drive | about $4,761 new (Seagate ST16000VE000) / about $3,400 refurbished (Seagate ST16000NM001G) / about $2,472 used (Seagate ST16000NM001G) -- one observed eBay unit price incl. shipping x bays; quantity availability unverified |
15 eBay listings checked Nov 9, 2026 · 10 new, 5 used
Documents
Compatible network and expansion cards
Check the required OS, firmware, slot, bracket, and installation notes before buying.
| Component | Specifications | Evidence | Requirements and notes | Buy |
|---|---|---|---|---|
| Intel Ethernet Converged Network Adapter X710-T4 | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 4 x 10GbE; Product code: X710-T4 | Officially certified Checked 2026-10-17 | Firmware: 5.05. DSM version requirement: 6.2-23739 or later version. (Only applicable to models with DSM.) | Amazon eBay |
| Marvell FastLinQ QL41134HLRJ | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 4 x 10GbE; Product code: QL41134HLRJ | Officially certified Checked 2026-10-17 | Firmware: 8.34.15. DSM version requirement: 6.2-24922 or later version. (Only applicable to models with DSM.) | Search Amazon eBay |
| Synology E10G30-F2 | Connector: SFP+; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-10-17 | DSM version requirement: 7.1.1-42962 Update 5 or later version. (Only applicable to models with DSM.); DSM Enterprise version requirement: 1.0-101178 or later version. (Only applicable to models with DSM Enterprise.); Remote Direct Memory Access (RDMA): Available on PAS7700 only. Applies to NFS over RDMA and NVMe over RDMA. | Amazon eBay |
| Synology E10G30-T1 | Connector: RJ45; Host interface: PCIe 3.0 x4; Ports: 1 x 10GbE | Officially certified Checked 2026-10-17 | DSM version requirement: 7.1.1-42962 Update 5 or later version. (Only applicable to models with DSM.) | Amazon eBay |
| Synology E10G30-T2 | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-10-17 | APM version requirement: 1.0-71430 or later version. (Only applicable to models with APM.); DSM version requirement: 7.1.1-42962 Update 5 or later version. (Only applicable to models with DSM.); DSM Enterprise version requirement: 1.0-101178 or later version. (Only applicable to models with DSM Enterprise.); Remote Direct Memory Access (RDMA): Available on PAS7700 only. Applies to NFS over RDMA and NVMe over RDMA. | Amazon eBay |
| Synology E25G30-F2 | Connector: SFP28; Host interface: PCIe 3.0 x8; Ports: 2 x 25GbE | Officially certified Checked 2026-10-17 | APM version requirement: 1.0-71430 or later version. (Only applicable to models with APM.); DSM version requirement: 7.1.1-42962 Update 5 or later version. (Only applicable to models with DSM.); DSM Enterprise version requirement: 1.0-101178 or later version. (Only applicable to models with DSM Enterprise.); Remote Direct Memory Access (RDMA): Available on PAS7700 only. Applies to NFS over RDMA and NVMe over RDMA.; For models with an AMD Ryzen V1000 CPU, DSM version 7.2.1-69057 or above is required. | Amazon eBay |
| Synology E10G17-F2 (EOL) | Connector: SFP+; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-10-17 | DSM version requirement: 6.0.2-8451 or later version. (Only applicable to models with DSM.) | Amazon eBay |
| Synology E10G18-T1 (EOL) | Connector: RJ45; Host interface: PCIe 3.0 x4; Ports: 1 x 10GbE | Officially certified Checked 2026-10-17 | DSM version requirement: 6.2-23739-2 onward (or 6.1-15284-2 onward with DSM 6.1). (Only applicable to models with DSM.) | Amazon eBay |
| Synology E10G18-T2 (EOL) | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-10-17 | DSM version requirement: 6.2.1-23824 or later version. (Only applicable to models with DSM.) | Amazon eBay |
| Synology E10G21-F2 (EOL) | Connector: SFP+; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-10-17 | DSM version requirement: 6.2.3-25426 or later version. (Only applicable to models with DSM.) | Amazon eBay |
| Synology E25G21-F2 (EOL) | Connector: SFP28; Host interface: PCIe 3.0 x8; Ports: 2 x 25GbE | Officially certified Checked 2026-10-17 | DSM version requirement: 6.2.3-25426 or later version. (Only applicable to models with DSM.); For best performance, we recommend using memory in dual-channel configuration. For instructions, refer to Hardware Installation Guide. | Amazon |
Compatible Drives
189 drives certified on DS1821+'s official manufacturer compatibility list, sourced directly from Synology's own published Hardware Compatibility List. Each model links to that drive's own compatibility page.
189certified models
5drive brands
24 TBlargest listed
164with verified extra specs
Certified drives by capacity
0.48 TB4
0.96 TB4
1 TB3
1.92 TB4
2 TB12
3 TB9
3.84 TB4
4 TB27
6 TB25
7 TB1
8 TB39
10 TB14
12 TB17
14 TB12
16 TB9
18 TB1
20 TB3
24 TB1
Show all 189 certified drives
189 shown
| Brand | Model | Capacity | Type | Verified drive details | Recently observed offers | Status | Firmware |
|---|---|---|---|---|---|---|---|
| Synology | HAT5320-24T details | 24.0 TB | 3.5" NAS HDD | 7200 RPM · 1024 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $1,553.83 | Recommended | 1401 |
| Synology | HAT5310-20T details | 20.0 TB | 3.5" Enterprise HDD | 7200 RPM · 512 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $899.95 · Used: $1,440.13 | Recommended | 1401 |
| Synology | HAT3320-20T details | 20.0 TB | 3.5" NAS HDD | 7200 RPM · 1024 MB cache · CMR · 180 TB/year workload · 1200000 h MTBF · 3-year warranty | New: $806.19 · Used: $780.00 | Recommended | 1401 |
| Synology | HAT5320-20T details | 20.0 TB | 3.5" NAS HDD | 7200 RPM · 1024 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $1,419.79 | Recommended | 1402 |
| Synology | HAT5310-18T details | 18.0 TB | 3.5" Enterprise HDD | 7200 RPM · 512 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | No recent verified offer | Recommended | 1401 |
| Toshiba | MN08ACA16T details | 16.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · 180 TB/year workload · 1200000 h MTBF | No recent verified offer | Recommended | 0601 |
| Seagate | ST16000VN001 details | 16.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $605.00 · Refurb: $699.00 | Recommended | SC60 |
| Synology | HAT5300-16T details | 16.0 TB | 3.5" Enterprise HDD | 7200 RPM · 512 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $782.49 · Used: $399.00 | Recommended | 1402 |
| Seagate | ST16000NM001G details | 16.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $349.00 · Refurb: $424.99 | Recommended | SN02 |
| Toshiba | HDWG31G*ZSTA details | 16.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Synology | HAT5310-16T details | 16.0 TB | 3.5" Enterprise HDD | 7200 RPM · 512 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $1,064.99 | Recommended | 1403 |
| Seagate | ST16000NE000 details | 16.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $648.25 · Used: $489.00 | Recommended | EN02 |
| Seagate | ST16000VE000 details | 16.0 TB | 3.5" Surveillance HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $595.12 | Recommended | EV02 |
| Synology | HAT3310-16T details | 16.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 180 TB/year workload · 1200000 h MTBF · 3-year warranty | New: $693.99 · Used: $505.00 | Recommended | 1402 |
| Toshiba | MN07ACA14T details | 14.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | 0601 |
| Western Digital | WD140EFGX details | 14.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 85.00A85 |
| Toshiba | HDWG21EEZSTA details | 14.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG21EYZSTA details | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST14000NE0008 details | 14.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $423.65 | Recommended | EN02 |
| Seagate | ST14000VE0008 details | 14.0 TB | 3.5" Surveillance HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 3-year warranty | New: $434.84 | Recommended | EV02 |
| Toshiba | HDWG21EXZSTA details | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST14000NM001G details | 14.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $410.00 · Used: $325.00 | Recommended | SN02 |
| Seagate | ST14000VN0008 details | 14.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $435.23 · Used: $349.99 | Recommended | SC61 |
| Toshiba | HDWG21EUZSVA details | 14.0 TB | 3.5" NAS HDD | 7200 RPM · CMR · 180 TB/year workload | No recent verified offer | Recommended | 0601 |
| Western Digital | WD141KFGX details | 14.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $462.00 | Recommended | 83.00A83 |
| Toshiba | HDWG21EAZSTA details | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| HGST | HUH721212ALE604 details | 12.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | No recent verified offer | Recommended | - |
| HGST | HUH721212ALE600 details | 12.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $330.00 · Used: $244.99 | Recommended | LEGNT3D0 |
| Seagate | ST12000VN0008 details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $413.88 · Used: $259.99 | Recommended | SC60 |
| Seagate | ST12000NM001G details | 12.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $442.00 · Used: $374.99 | Recommended | SN02 |
| Western Digital | WD120EFBX details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 85.00A85 |
| Synology | HAT5300-12T details | 12.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $589.99 · Used: $379.99 | Recommended | 1401 |
| Synology | HAT3300-12T details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | PL01 |
| Toshiba | HDWG21CYZSTA details | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST12000VE0008 details | 12.0 TB | 3.5" Surveillance HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $458.16 | Recommended | EV02 |
| Toshiba | HDWG21CAZSTA details | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG21CEZSTA details | 12.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Seagate | ST12000NE0008 details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $445.00 · Refurb: $384.99 | Recommended | EN02 |
| Toshiba | MN07ACA12T details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | Used: $1,082.45 | Recommended | 0601 |
| Synology | HAT3310-12T details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 180 TB/year workload · 1200000 h MTBF · 3-year warranty | New: $550.99 | Recommended | 1402 |
| Toshiba | HDWG21CXZSTA details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0601 |
| Western Digital | WD121KFBX details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | Used: $425.00 | Recommended | 83.00A83 |
| Toshiba | HDWG21CUZSVA details | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG11AAZSTA details | 10.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Seagate | ST10000NE0008 details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $471.70 · Used: $257.29 | Recommended | EN02 |
| Western Digital | WD102KFBX details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $500.00 · Used: $399.94 | Recommended | 83.00A83 |
| Toshiba | HDWG11AEZSTA details | 10.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0603 |
| Western Digital | WD101EFBX details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 85.00A85 |
| HGST | HUH721010ALE600 details | 10.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $321.00 · Refurb: $269.99 | Recommended | LHGNT384 |
| Seagate | ST10000VN000 details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $399.00 | Recommended | SC60 |
| Seagate | ST10000NM001G details | 10.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $396.00 · Used: $299.99 | Recommended | SN02 |
| Seagate | ST10000VE0008 details | 10.0 TB | 3.5" Surveillance HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $410.00 · Used: $187.49 | Recommended | EV02 |
| Toshiba | MN06ACA10T details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG11AUZSVA details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | Used: $326.00 | Recommended | 0603 |
| Toshiba | HDWG11AYZSTA details | 10.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG11AXZSTA details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0603 |
| Seagate | ST10000VN0008 details | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $400.00 · Used: $249.99 | Recommended | SC61 |
| Toshiba | HDWG180YZSTA details | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG480YZSTA details | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWN180EZSTA details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | - |
| Toshiba | HDWG180EZSTA details | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | MN06ACA800 details | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG180AZSTA details | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| HGST | HUH721008ALE600 details | 8.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | Used: $248.51 | Recommended | - |
| Synology | HAT3320-8T details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 3-year warranty | New: $554.00 | Recommended | 1401 |
| Western Digital | WD80EFZZ details | 8.0 TB | 3.5" NAS HDD | 5640 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $349.00 | Recommended | 81.00A81 |
| Toshiba | HDWN180YZSTA details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | - |
| Seagate | ST8000VX004 details | 8.0 TB | 3.5" Surveillance HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $349.87 | Recommended | AV01 |
| Toshiba | HDWG180XZSTA details | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Western Digital | WD82EJRX details | 8.0 TB | 3.5" Surveillance HDD | 7200 RPM · 256 MB cache · 360 TB/year workload · 3-year warranty | No recent verified offer | Recommended | 82.00A82 |
| Toshiba | HDWG180UZSVA details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 3-year warranty | New: $576.08 | Recommended | 0603 |
| Western Digital | WD82PURZ details | 8.0 TB | 3.5" Surveillance HDD | 7200 RPM · 256 MB cache · CMR · 360 TB/year workload · 1500000 h MTBF · 3-year warranty | New: $620.00 · Used: $128.88 | Recommended | 82.00A82 |
| Toshiba | HDWG480AZSTA details | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Synology | HAT3310-8T details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1200000 h MTBF · 3-year warranty | New: $405.00 · Used: $295.00 | Recommended | 1403 |
| Synology | HAT5310-8T details | 8.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $1,027.37 · Used: $199.99 | Recommended | 1402 |
| Synology | HAT5320-8T details | 8.0 TB | 3.5" Enterprise HDD | 7200 RPM · 512 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $702.17 | Recommended | 1401 |
| Seagate | ST8000NM000A details | 8.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $414.99 · Used: $249.00 | Recommended | SN02 |
| Synology | HAT3300-8T details | 8.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | Used: $299.99 | Recommended | PL01 |
| Western Digital | WD82PURX details | 8.0 TB | 3.5" Surveillance HDD | 256 MB cache · CMR · 360 TB/year workload · 3-year warranty | No recent verified offer | Recommended | 82.00A82 |
| Toshiba | MN05ACA800 details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | GX2M |
| Toshiba | HDWG480XZSTA details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 180 TB/year workload · 1200000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0601 |
| Seagate | ST8000NE001 details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $408.35 · Refurb: $314.99 | Recommended | EN01 |
| Toshiba | HDWN180UZSVA details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | - |
| Seagate | ST8000VN002 details | 8.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $390.64 | Recommended | SC60 |
| Western Digital | WD82EVRX details | 8.0 TB | 3.5" Surveillance HDD | - | No recent verified offer | Recommended | 82.00A82 |
| Western Digital | WD8003FFBX details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | Used: $295.00 | Recommended | 83.00A83 |
| Western Digital | WD80EFPX details | 8.0 TB | 3.5" NAS HDD | 5640 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $299.99 · Used: $637.75 | Recommended | 81.00A81 |
| Toshiba | HDWN180XZSTA details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | - |
| Seagate | ST8000VN004 details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $316.49 | Recommended | SC60 |
| Toshiba | MN08ADA800 details | 8.0 TB | 3.5" NAS HDD | 256 MB cache · 1000000 h MTBF | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG480UZSVA details | 8.0 TB | 3.5" NAS HDD | 256 MB cache · CMR | No recent verified offer | Recommended | 0601 |
| Synology | HAT5300-8T details | 8.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2500000 h MTBF · 5-year warranty | New: $998.00 · Used: $225.00 | Recommended | 1401 |
| Toshiba | HDWG480EZSTA details | 8.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Western Digital | WD80EFZX details | 8.0 TB | 3.5" NAS HDD | 5640 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $339.98 · Used: $205.00 | Recommended | 81.00A81 |
| Toshiba | HDWN180AZSTA details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | - |
| Western Digital | WD80EFBX details | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $300.00 | Recommended | 85.00A85 |
| Synology | SAT5210-7000G details | 7.0 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 10000 TBW | New: $7,439.58 | Recommended | SCEMH5.0 |
| Toshiba | HDWG460AZSTA details | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG160EZSTA details | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG460EZSTA details | 6.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG460UZSVA details | 6.0 TB | 3.5" NAS HDD | 256 MB cache · CMR · 3-year warranty | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG160UZSVA details | 6.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0603 |
| Synology | HAT3300-6T details | 6.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $306.99 · Used: $211.00 | Recommended | PL01 |
| Western Digital | WD60EFPX details | 6.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $315.04 | Recommended | 81.00A81 |
| Seagate | ST6000VN006 details | 6.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $212.58 | Recommended | SC60 |
| Toshiba | MN08ADA600 details | 6.0 TB | 3.5" NAS HDD | 256 MB cache · 1000000 h MTBF | No recent verified offer | Recommended | 0601 |
| Seagate | ST6000VN001 details | 6.0 TB | 3.5" Enterprise HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $217.61 | Recommended | SC60 |
| Toshiba | MN06ACA600 details | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Western Digital | WD60PURX details | 6.0 TB | 3.5" Surveillance HDD | 7200 RPM · 64 MB cache · CMR · 180 TB/year workload · 1500000 h MTBF · 3-year warranty | New: $299.99 · Refurb: $169.99 | Recommended | 80.00A80 |
| Toshiba | HDWG460YZSTA details | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST6000VX001 details | 6.0 TB | 3.5" Surveillance HDD | 5900 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $249.99 · Refurb: $275.00 | Recommended | CV11 |
| Toshiba | HDWG160AZSTA details | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Western Digital | WD60PURZ details | 6.0 TB | 3.5" Surveillance HDD | 5700 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $310.00 · Refurb: $189.99 | Recommended | 80.00A80 |
| Western Digital | WD60EFZX details | 6.0 TB | 3.5" NAS HDD | 5640 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $305.41 · Used: $552.29 | Recommended | 81.00A81 |
| Toshiba | HDWG460XZSTA details | 6.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 180 TB/year workload · 1200000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0601 |
| HGST | HUS726T6TALE6L4 details | 6.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | No recent verified offer | Recommended | VKGNW40H |
| Toshiba | HDWG160XZSTA details | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG160YZSTA details | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Western Digital | WD60EJRX details | 6.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | - |
| Seagate | ST6000NE000 details | 6.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $218.32 · Used: $199.12 | Recommended | EN01 |
| Western Digital | WD6003FFBX details | 6.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $479.06 | Recommended | 83.00A83 |
| Seagate | ST6000NM021A details | 6.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $200.67 · Refurb: $220.00 | Recommended | SN02 |
| Toshiba | HDWG440YZSTA details | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Western Digital | WD40PURX details | 4.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $135.00 · Refurb: $139.99 | Recommended | 80.00A80 |
| Toshiba | HDWQ140UZSVA details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | Used: $298.99 | Recommended | - |
| Toshiba | HDWQ140EZSTA details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | - |
| Western Digital | WD40PURZ details | 4.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $139.58 · Used: $84.99 | Recommended | - |
| Western Digital | WD4003FFBX details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $289.19 · Used: $104.93 | Recommended | - |
| Synology | HAT3300-4T details | 4.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $348.72 · Used: $175.00 | Recommended | PL01 |
| Seagate | ST4000VN008 details | 4.0 TB | 3.5" NAS HDD | 5900 RPM · 256 MB cache · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $136.25 · Refurb: $165.00 | Recommended | SC60 |
| Seagate | ST4000NE001 details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $139.00 · Used: $127.50 | Recommended | EN01 |
| Synology | HAT5300-4T details | 4.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | No recent verified offer | Recommended | 1403 |
| Toshiba | HDWG440AZSTA details | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG440UZSVA details | 4.0 TB | 3.5" NAS HDD | 256 MB cache · CMR | No recent verified offer | Recommended | 0601 |
| Western Digital | WD40EFPX details | 4.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $133.98 | Recommended | 81.00A81 |
| Seagate | ST4000VN006 details | 4.0 TB | 3.5" NAS HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $161.57 · Used: $159.99 | Recommended | SC60 |
| Toshiba | HDWG440EZSTA details | 4.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Toshiba | MN08ADA400E details | 4.0 TB | 3.5" NAS HDD | 256 MB cache · 1000000 h MTBF | No recent verified offer | Recommended | 0601 |
| Synology | HAT5320-4T details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 512 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $567.27 | Recommended | 1401 |
| Toshiba | MN04ACA400 details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | FJ1M |
| Seagate | ST4000NM002A details | 4.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $134.99 · Used: $79.99 | Recommended | SN02 |
| Toshiba | HDWQ140AZSTA details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | - |
| Toshiba | HDWQ140XZSTA details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | - |
| Toshiba | HDWG440XZSTA details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | 0601 |
| Western Digital | WD40EFZX details | 4.0 TB | 3.5" NAS HDD | 5400 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $138.50 · Used: $275.00 | Recommended | 81.00B81 |
| Toshiba | MG04ACA400E details | 4.0 TB | 3.5" Enterprise HDD | 7200 RPM · 128 MB cache · CMR · 550 TB/year workload · 1400000 h MTBF · 5-year warranty | New: $270.76 · Refurb: $175.00 | Recommended | FP4B |
| Toshiba | HDWQ140YZSTA details | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 128 MB cache · 180 TB/year workload · 1000000 h MTBF | No recent verified offer | Recommended | - |
| Western Digital | WD40EJRX details | 4.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1500000 h MTBF · 3-year warranty | New: $134.32 | Recommended | - |
| HGST | HUS726T4TALE6L4 details | 4.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | No recent verified offer | Recommended | VKGNW40H |
| Synology | SAT5220-3840G details | 3.84 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 7000 TBW | No recent verified offer | Recommended | SCEMH5.0 |
| Synology | SAT5200-3840G details | 3.84 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 9162 TBW | No recent verified offer | Recommended | SCEMJ2.1 |
| Synology | SAT5210-3840G details | 3.84 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 8533 TBW | No recent verified offer | Recommended | SCEMH3.1 |
| Synology | SAT5221-3840G details | 3.84 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 7000 TBW | New: $3,803.00 | Recommended | SCEM16.3 |
| Seagate | ST3000VN007 details | 3.0 TB | 3.5" NAS HDD | 5900 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $91.25 · Refurb: $154.00 | Recommended | - |
| Western Digital | WD30EFZX details | 3.0 TB | 3.5" NAS HDD | 5400 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $92.71 | Recommended | 81.00B81 |
| Western Digital | WD30PURZ details | 3.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $355.46 · Used: $71.99 | Recommended | - |
| Seagate | ST3000VX009 details | 3.0 TB | 3.5" Surveillance HDD | 5900 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $129.90 · Used: $69.99 | Recommended | CV11 |
| Western Digital | WD30EFPX details | 3.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $457.98 · Used: $339.47 | Recommended | 81.00A81 |
| Seagate | ST3000VN006 details | 3.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $288.30 | Recommended | SC60 |
| Western Digital | WD30EJRX details | 3.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 3-year warranty | No recent verified offer | Recommended | - |
| Western Digital | WD30PURX details | 3.0 TB | 3.5" Surveillance HDD | 7200 RPM · 64 MB cache · CMR · 180 TB/year workload · 1500000 h MTBF · 3-year warranty | New: $83.45 · Used: $69.00 | Recommended | - |
| Toshiba | MG04ACA300E details | 3.0 TB | 3.5" Enterprise HDD | 7200 RPM · 128 MB cache · CMR · 550 TB/year workload · 1400000 h MTBF · 5-year warranty | New: $284.00 · Used: $59.99 | Recommended | FP4B |
| Seagate | ST2000VN004 details | 2.0 TB | 3.5" NAS HDD | 5900 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $79.72 · Used: $75.00 | Recommended | - |
| HGST | HUS722T2TALA604 details | 2.0 TB | 3.5" Enterprise HDD | 7200 RPM · 128 MB cache · CMR · 2000000 h MTBF · 5-year warranty | New: $284.13 · Used: $114.99 | Recommended | RAGNWA07 |
| Western Digital | WD20EFZX details | 2.0 TB | 3.5" NAS HDD | 5400 RPM · 128 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $167.76 · Used: $290.49 | Recommended | 81.00B81 |
| Western Digital | WD20PURZ details | 2.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $84.63 · Refurb: $84.99 | Recommended | - |
| Seagate | ST2000VN003 details | 2.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $245.90 · Used: $178.17 | Recommended | SC60 |
| Western Digital | WD20PURX details | 2.0 TB | 3.5" Surveillance HDD | 7200 RPM · 64 MB cache · CMR · 180 TB/year workload · 1500000 h MTBF · 3-year warranty | New: $82.52 · Used: $78.15 | Recommended | - |
| Western Digital | WD20EJRX details | 2.0 TB | 3.5" Surveillance HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $82.62 · Refurb: $79.99 | Recommended | - |
| Toshiba | MG04ACA200E details | 2.0 TB | 3.5" Enterprise HDD | 7200 RPM · 128 MB cache · CMR · 550 TB/year workload · 1400000 h MTBF · 5-year warranty | New: $186.08 · Refurb: $300.00 | Recommended | FP4B |
| Synology | HAT3300-2T details | 2.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $671.92 · Used: $139.99 | Recommended | PL01 |
| Seagate | ST2000NE001 details | 2.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $366.61 | Recommended, EOL | EN01 |
| Western Digital | WD20EFPX details | 2.0 TB | 3.5" NAS HDD | 5400 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $230.60 | Recommended | 81.00A81 |
| Seagate | ST2000NM001A details | 2.0 TB | 3.5" Enterprise HDD | 7200 RPM · 256 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | Refurb: $270.76 · Used: $49.00 | Recommended | SN02 |
| Synology | SAT5210-1920G details | 1.92 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 4800 TBW | No recent verified offer | Recommended | SCEMH3.2 |
| Synology | SAT5220-1920G details | 1.92 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 3500 TBW | New: $799.99 | Recommended | SCEMH5.0 |
| Synology | SAT5221-1920G details | 1.92 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 3500 TBW | New: $2,200.01 · Refurb: $2,255.63 | Recommended | SCEM16.3 |
| Synology | SAT5200-1920G details | 1.92 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 4581 TBW | No recent verified offer | Recommended | SCEMJ2.1 |
| HGST | HUS722T1TALA604 details | 1.0 TB | 3.5" Enterprise HDD | 7200 RPM · 128 MB cache · CMR · 550 TB/year workload · 2000000 h MTBF · 5-year warranty | New: $119.99 · Refurb: $200.57 | Recommended | - |
| Seagate | ST1000VN008 details | 1.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | No recent verified offer | Recommended | SC60 |
| Seagate | ST1000VN002 details | 1.0 TB | 3.5" NAS HDD | 5900 RPM · 64 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $120.00 · Used: $29.99 | Recommended | - |
| Synology | SAT5200-960G details | 0.96 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 2290 TBW | No recent verified offer | Recommended | SCEMJ2.1 |
| Synology | SAT5210-960G details | 0.96 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 2194 TBW | No recent verified offer | Recommended | SCEMH3.2 |
| Synology | SAT5221-960G details | 0.96 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 1700 TBW | New: $1,177.29 | Recommended | F3MN902 |
| Synology | SAT5220-960G details | 0.96 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 1700 TBW | No recent verified offer | Recommended | SCEMH5.0 |
| Synology | SAT5210-480G details | 0.48 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 1097 TBW | No recent verified offer | Recommended | SCEMH3.1 |
| Synology | SAT5220-480G details | 0.48 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 900 TBW | No recent verified offer | Recommended | SCEMH5.0 |
| Synology | SAT5221-480G details | 0.48 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 900 TBW | No recent verified offer | Recommended | F3MN902 |
| Synology | SAT5200-480G details | 0.48 TB | 2.5" Enterprise SSD | 1500000 h MTBF · 5-year warranty · 1145 TBW | No recent verified offer | Recommended | SCEMJ2.1 |
Extra drive details are published only from manufacturer-owned documents or explicit human review. Follow the model link for field-level sources.
Certified list last checked 2026-08-18.
Compatible Memory
5 memory modules listed by Synology as compatible with DS1821+. Third-party modules may also work, but are not shown here unless Synology itself lists them as compatible.
5certified modules
4–16 GBcapacity range
| SKU | Capacity | DDR generation | ECC | Form factor | Rated speed | Warranty | Source and notes | Buy |
|---|---|---|---|---|---|---|---|---|
| D4ECSO-2666-16G | 16 GB | DDR4 | ECC | SODIMM | 2666 MT/s | 5-year | Manufacturer source Checked 2026-09-16 | Amazon eBay |
| D4ES03-16G | 16 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 | Amazon eBay |
| D4ES01-8G | 8 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 | Amazon eBay |
| D4ES01-4G | 4 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 | Amazon eBay |
| D4ES04-4G | 4 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 | Amazon eBay |
Certified list last checked 2026-09-16. Coverage varies by model. Rated module speed is not a guarantee of NAS operating speed; follow the NAS maximum capacity and installation rules.
Looking for cameras compatible with Synology NAS units? See the full Synology camera compatibility database.