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Status: Currently sold
| 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 |
| 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 | 2x USB 3.2 Gen 1 |
| PCIe expansion | 1 |
| Drive bay types | 3.5" SATA HDD, 2.5" SATA HDD, 2.5" SATA SSD |
| Hot-swappable bays | yes |
| CPU frequency (GHz) | 2.2 |
| Max bays with expansion unit | 12 |
| Power draw, active (W) | 61.94 |
| Power draw, hibernation (W) | 29.98 |
| Power supply (W) | 350 |
| Noise level (dBA) | 53.5 |
| Dimensions H x W x D (mm) | 88 x 482 x 407.5 |
| Weight (kg) | 8.4 |
| 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 (Seagate ST8000VN004) / about $2,000 used (Seagate ST8000VN004) -- 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 $4,000 new (Seagate ST16000VE000) / about $4,853 refurbished (Seagate ST16000NE000) / about $3,032 used (Seagate ST16000NE000) -- one observed eBay unit price incl. shipping x bays; quantity availability unverified |
8 eBay listings checked Aug 8, 2026 · 5 new, 3 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 |
|---|---|---|---|
| Intel Ethernet Converged Network Adapter X710-T4 | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 4 x 10GbE | Officially certified Checked 2026-09-16 | Firmware: 5.05. DSM version requirement: 6.2-23739 or later version. (Only applicable to models with DSM.) |
| Marvell FastLinQ QL41134HLRJ | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 4 x 10GbE | Officially certified Checked 2026-09-16 | Firmware: 8.34.15. DSM version requirement: 6.2-24922 or later version. (Only applicable to models with DSM.) |
| Synology E10G30-F2 | Connector: SFP+; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-09-16 | 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. |
| Synology E10G30-T1 | Connector: RJ45; Host interface: PCIe 3.0 x4; Ports: 1 x 10GbE | Officially certified Checked 2026-09-16 | DSM version requirement: 7.1.1-42962 Update 5 or later version. (Only applicable to models with DSM.) |
| Synology E10G30-T2 | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-09-16 | 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. |
| Synology E10M20-T1 | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 1 x 10GbE | Officially certified Checked 2026-09-16 | DSM version requirement: 6.2.3-25426 or later version. (Only applicable to models with DSM.) |
| Synology E10M20-T1 | Storage interface: PCIe NVMe; Supported form factor: 2280 / 22110 | Officially certified Checked 2026-09-16 | DSM version requirement: 6.2.3-25426 or later version.; DSM version requirement for RS18017xs+, RS4017xs+, RS3618xs, RS3617xs+, RS3617RPxs, DS3617xs and DS3617xsII: 7.0.1 or later version. |
| Synology E25G30-F2 | Connector: SFP28; Host interface: PCIe 3.0 x8; Ports: 2 x 25GbE | Officially certified Checked 2026-09-16 | 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. |
| Synology M2D18 | Storage interface: PCIe NVMe / SATA; Supported form factor: 2280 / 2260 / 2242 | Officially certified Checked 2026-09-16 | DSM version requirement: 6.2-23739-2 onward (or 6.1-15284-2 onward with DSM 6.1).; RS1221RP+, RS1221+, RS822RP+, and RS822+ only support M.2 NVMe SSD with the M2D18 add-in card.; Operating system requirement for RS1221RP+, RS1221+, RS822RP+, and RS822+: DSM 7.2-64551 or later. |
| Synology M2D20 | Storage interface: PCIe NVMe; Supported form factor: 2280 / 22110 | Officially certified Checked 2026-09-16 | DSM version requirement: 6.2.3-25426 or later version.; DSM version requirement for RS18017xs+, RS4017xs+, RS3618xs, RS3617xs+, RS3617RPxs, DS3617xs and DS3617xsII: 7.0.1 or later version. |
| Synology E10G17-F2 (EOL) | Connector: SFP+; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-09-16 | DSM version requirement: 6.0.2-8451 or later version. (Only applicable to models with DSM.) |
| Synology E10G18-T1 (EOL) | Connector: RJ45; Host interface: PCIe 3.0 x4; Ports: 1 x 10GbE | Officially certified Checked 2026-09-16 | DSM version requirement: 6.2-23739-2 onward (or 6.1-15284-2 onward with DSM 6.1). (Only applicable to models with DSM.) |
| Synology E10G18-T2 (EOL) | Connector: RJ45; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-09-16 | DSM version requirement: 6.2.1-23824 or later version. (Only applicable to models with DSM.) |
| Synology E10G21-F2 (EOL) | Connector: SFP+; Host interface: PCIe 3.0 x8; Ports: 2 x 10GbE | Officially certified Checked 2026-09-16 | DSM version requirement: 6.2.3-25426 or later version. (Only applicable to models with DSM.) |
| Synology E25G21-F2 (EOL) | Connector: SFP28; Host interface: PCIe 3.0 x8; Ports: 2 x 25GbE | Officially certified Checked 2026-09-16 | 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. |
Compatible Drives
150 drives certified on RS1221+'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.
150certified models
5drive brands
24 TBlargest listed
55with verified extra specs
Certified drives by capacity
0.48 TB4
0.96 TB4
1 TB3
1.92 TB4
2 TB7
3 TB4
3.84 TB4
4 TB22
6 TB20
7 TB1
8 TB29
10 TB13
12 TB13
14 TB11
16 TB6
18 TB1
20 TB3
24 TB1
Show all 150 certified drives
150 shown
| Brand | Model | Capacity | Type | Verified drive details | Recently observed offers | Status | Firmware |
|---|---|---|---|---|---|---|---|
| Synology | HAT5320-24T | 24.0 TB | 3.5" NAS HDD | - | New: $1,418.86 | Recommended | 1401 |
| Synology | HAT5310-20T | 20.0 TB | 3.5" NAS HDD | - | New: $873.06 · Used: $1,471.01 | Recommended | 1401 |
| Synology | HAT3320-20T | 20.0 TB | 3.5" NAS HDD | - | New: $836.49 | Recommended | 1401 |
| Synology | HAT5320-20T | 20.0 TB | 3.5" NAS HDD | - | New: $1,483.11 | Recommended | 1402 |
| Synology | HAT5310-18T | 18.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 1401 |
| Seagate | ST16000VN001 | 16.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $587.99 · Refurb: $699.00 | Recommended | SC60 |
| Synology | HAT5300-16T | 16.0 TB | 3.5" NAS HDD | - | New: $1,126.65 · Used: $556.14 | Recommended | 1402 |
| Synology | HAT5310-16T | 16.0 TB | 3.5" NAS HDD | - | New: $1,067.99 | Recommended | 1403 |
| Seagate | ST16000NE000 | 16.0 TB | 3.5" NAS HDD | 5-year warranty | New: $525.00 · Refurb: $606.65 | Recommended | EN02 |
| Seagate | ST16000VE000 | 16.0 TB | 3.5" Surveillance HDD | - | New: $499.99 · Used: $390.00 | Recommended | EV02 |
| Synology | HAT3310-16T | 16.0 TB | 3.5" NAS HDD | - | New: $599.00 | Recommended | 1402 |
| Toshiba | MN07ACA14T | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG21EEZSTA | 14.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG21EYZSTA | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST14000NE0008 | 14.0 TB | 3.5" NAS HDD | 5-year warranty | New: $430.00 · Used: $353.14 | Recommended | EN02 |
| Seagate | ST14000VE0008 | 14.0 TB | 3.5" Surveillance HDD | 256 MB cache | New: $438.78 | Recommended | EV02 |
| Toshiba | HDWG21EXZSTA | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST14000NM001G | 14.0 TB | 3.5" Enterprise HDD | 5-year warranty | New: $399.99 · Used: $279.00 | Recommended | SN02 |
| Seagate | ST14000VN0008 | 14.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $434.00 · Used: $350.00 | Recommended | SC61 |
| Toshiba | HDWG21EUZSVA | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Western Digital | WD141KFGX | 14.0 TB | 3.5" NAS HDD | - | New: $462.00 | Recommended | 83.00A83 |
| Toshiba | HDWG21EAZSTA | 14.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST12000VN0008 | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $409.99 · Used: $299.99 | Recommended | SC60 |
| Synology | HAT5300-12T | 12.0 TB | 3.5" NAS HDD | - | New: $589.99 · Used: $286.00 | Recommended | 1401 |
| Synology | HAT3300-12T | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | PL01 |
| Toshiba | HDWG21CYZSTA | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST12000VE0008 | 12.0 TB | 3.5" Surveillance HDD | 256 MB cache | New: $440.00 | Recommended | EV02 |
| Toshiba | HDWG21CAZSTA | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG21CEZSTA | 12.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Seagate | ST12000NE0008 | 12.0 TB | 3.5" NAS HDD | 5-year warranty | New: $438.07 · Refurb: $359.99 | Recommended | EN02 |
| Toshiba | MN07ACA12T | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Synology | HAT3310-12T | 12.0 TB | 3.5" NAS HDD | - | New: $530.49 | Recommended | 1402 |
| Toshiba | HDWG21CXZSTA | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Western Digital | WD121KFBX | 12.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 5-year warranty | No recent verified offer | Recommended | 83.00A83 |
| Toshiba | HDWG21CUZSVA | 12.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG11AAZSTA | 10.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Seagate | ST10000NE0008 | 10.0 TB | 3.5" NAS HDD | 5-year warranty | New: $392.00 · Used: $257.29 | Recommended | EN02 |
| Western Digital | WD102KFBX | 10.0 TB | 3.5" NAS HDD | - | Used: $405.94 | Recommended | 83.00A83 |
| Toshiba | HDWG11AEZSTA | 10.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0603 |
| HGST | HUH721010ALE600 | 10.0 TB | 3.5" Enterprise HDD | - | New: $321.00 · Refurb: $359.99 | Recommended | LHGNT384 |
| Seagate | ST10000VN000 | 10.0 TB | 3.5" NAS HDD | - | New: $414.00 | Recommended | SC60 |
| Seagate | ST10000NM001G | 10.0 TB | 3.5" Enterprise HDD | 5-year warranty | New: $384.00 · Used: $999.00 | Recommended | SN02 |
| Seagate | ST10000VE0008 | 10.0 TB | 3.5" Surveillance HDD | 256 MB cache | New: $410.00 | Recommended | EV02 |
| Toshiba | MN06ACA10T | 10.0 TB | 3.5" NAS HDD | - | New: $348.77 | Recommended | 0603 |
| Toshiba | HDWG11AUZSVA | 10.0 TB | 3.5" NAS HDD | 3-year warranty | Used: $360.34 | Recommended | 0603 |
| Toshiba | HDWG11AYZSTA | 10.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG11AXZSTA | 10.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Seagate | ST10000VN0008 | 10.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 1000000 h MTBF · 3-year warranty | New: $400.00 · Used: $257.28 | Recommended | SC61 |
| Toshiba | HDWG180YZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG480YZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWN180EZSTA | 8.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | - |
| Toshiba | HDWG180EZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | MN06ACA800 | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG180AZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Synology | HAT3320-8T | 8.0 TB | 3.5" NAS HDD | - | New: $653.12 | Recommended | 1401 |
| Toshiba | HDWN180YZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | - |
| Seagate | ST8000VX004 | 8.0 TB | 3.5" Surveillance HDD | 3-year warranty | New: $349.86 | Recommended | AV01 |
| Toshiba | HDWG180XZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG180UZSVA | 8.0 TB | 3.5" NAS HDD | - | New: $603.24 | Recommended | 0603 |
| Toshiba | HDWG480AZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Synology | HAT3310-8T | 8.0 TB | 3.5" NAS HDD | - | New: $4,338.04 · Used: $295.00 | Recommended | 1403 |
| Synology | HAT5310-8T | 8.0 TB | 3.5" NAS HDD | - | New: $1,077.87 · Used: $500.00 | Recommended | 1402 |
| Synology | HAT5320-8T | 8.0 TB | 3.5" NAS HDD | - | New: $702.17 | Recommended | 1401 |
| Synology | HAT3300-8T | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | PL01 |
| Toshiba | MN05ACA800 | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | GX2M |
| Toshiba | HDWG480XZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST8000NE001 | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $410.00 · Used: $398.99 | Recommended | EN01 |
| Toshiba | HDWN180UZSVA | 8.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | - |
| Seagate | ST8000VN002 | 8.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · 1000000 h MTBF · 3-year warranty | New: $390.64 | Recommended | SC60 |
| Western Digital | WD8003FFBX | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 5-year warranty | Used: $572.16 | Recommended | 83.00A83 |
| Toshiba | HDWN180XZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | - |
| Seagate | ST8000VN004 | 8.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 180 TB/year workload · 1000000 h MTBF · 3-year warranty | New: $299.99 · Used: $249.99 | Recommended | SC60 |
| Toshiba | MN08ADA800 | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG480UZSVA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Synology | HAT5300-8T | 8.0 TB | 3.5" NAS HDD | - | New: $1,046.00 · Used: $399.99 | Recommended | 1401 |
| Toshiba | HDWG480EZSTA | 8.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWN180AZSTA | 8.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | - |
| Synology | SAT5210-7000G | 7.0 TB | 2.5" Enterprise SSD | 5-year warranty | New: $7,602.24 | Recommended | SCEMH5.0 |
| Toshiba | HDWG460AZSTA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG160EZSTA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG460EZSTA | 6.0 TB | 3.5" NAS HDD | 3-year warranty | New: $460.91 | Recommended | 0601 |
| Toshiba | HDWG460UZSVA | 6.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG160UZSVA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Synology | HAT3300-6T | 6.0 TB | 3.5" NAS HDD | - | New: $305.99 · Used: $211.00 | Recommended | PL01 |
| Seagate | ST6000VN006 | 6.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · 1000000 h MTBF · 3-year warranty | New: $209.98 | Recommended | SC60 |
| Toshiba | MN08ADA600 | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST6000VN001 | 6.0 TB | 3.5" NAS HDD | - | New: $205.99 | Recommended | SC60 |
| Toshiba | MN06ACA600 | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG460YZSTA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Seagate | ST6000VX001 | 6.0 TB | 3.5" Surveillance HDD | - | Refurb: $159.99 · Used: $174.99 | Recommended | CV11 |
| Toshiba | HDWG160AZSTA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG460XZSTA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| HGST | HUS726T6TALE6L4 | 6.0 TB | 3.5" Enterprise HDD | - | No recent verified offer | Recommended | VKGNW40H |
| Toshiba | HDWG160XZSTA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Toshiba | HDWG160YZSTA | 6.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0603 |
| Seagate | ST6000NE000 | 6.0 TB | 3.5" NAS HDD | 5-year warranty | New: $199.00 · Used: $319.99 | Recommended | EN01 |
| Western Digital | WD6003FFBX | 6.0 TB | 3.5" NAS HDD | - | New: $538.73 | Recommended | 83.00A83 |
| Seagate | ST6000NM021A | 6.0 TB | 3.5" Enterprise HDD | - | New: $199.99 · Used: $138.95 | Recommended | SN02 |
| Toshiba | HDWG440YZSTA | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWQ140UZSVA | 4.0 TB | 3.5" NAS HDD | - | Used: $298.99 | Recommended | - |
| Toshiba | HDWQ140EZSTA | 4.0 TB | 3.5" NAS HDD | 3-year warranty | No recent verified offer | Recommended | - |
| Western Digital | WD4003FFBX | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 5-year warranty | New: $289.19 · Used: $275.00 | Recommended | - |
| Synology | HAT3300-4T | 4.0 TB | 3.5" NAS HDD | - | New: $356.20 | Recommended | PL01 |
| Seagate | ST4000VN008 | 4.0 TB | 3.5" NAS HDD | 5900 RPM · 64 MB cache · 1000000 h MTBF · 3-year warranty | New: $138.98 · Refurb: $132.00 | Recommended | SC60 |
| Seagate | ST4000NE001 | 4.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · CMR · 300 TB/year workload · 1200000 h MTBF · 5-year warranty | New: $133.90 · Used: $130.00 | Recommended | EN01 |
| Synology | HAT5300-4T | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 1403 |
| Toshiba | HDWG440AZSTA | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | HDWG440UZSVA | 4.0 TB | 3.5" NAS HDD | - | Used: $225.00 | Recommended | 0601 |
| Seagate | ST4000VN006 | 4.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · 1000000 h MTBF · 3-year warranty | New: $162.50 · Used: $134.95 | Recommended | SC60 |
| Toshiba | HDWG440EZSTA | 4.0 TB | 3.5" NAS HDD | 3-year warranty | New: $342.54 | Recommended | 0601 |
| Toshiba | MN08ADA400E | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Synology | HAT5320-4T | 4.0 TB | 3.5" NAS HDD | - | New: $426.35 | Recommended | 1401 |
| Toshiba | MN04ACA400 | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | FJ1M |
| Seagate | ST4000NM002A | 4.0 TB | 3.5" Enterprise HDD | - | New: $341.45 · Refurb: $189.99 | Recommended | SN02 |
| Toshiba | HDWQ140AZSTA | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | - |
| Toshiba | HDWQ140XZSTA | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | - |
| Toshiba | HDWG440XZSTA | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | 0601 |
| Toshiba | MG04ACA400E | 4.0 TB | 3.5" Enterprise HDD | 3-year warranty | New: $282.27 · Refurb: $175.00 | Recommended | FP4B |
| Toshiba | HDWQ140YZSTA | 4.0 TB | 3.5" NAS HDD | - | No recent verified offer | Recommended | - |
| HGST | HUS726T4TALE6L4 | 4.0 TB | 3.5" Enterprise HDD | - | New: $328.60 | Recommended | VKGNW40H |
| Synology | SAT5220-3840G | 3.84 TB | 2.5" Enterprise SSD | - | No recent verified offer | Recommended | SCEMH5.0 |
| Synology | SAT5200-3840G | 3.84 TB | 2.5" Enterprise SSD | - | No recent verified offer | Recommended | SCEMJ2.1 |
| Synology | SAT5210-3840G | 3.84 TB | 2.5" Enterprise SSD | 5-year warranty | No recent verified offer | Recommended | SCEMH3.1 |
| Synology | SAT5221-3840G | 3.84 TB | 2.5" Enterprise SSD | 5-year warranty | New: $975.00 | Recommended | SCEM16.3 |
| Seagate | ST3000VN007 | 3.0 TB | 3.5" NAS HDD | 5900 RPM · 64 MB cache · 1000000 h MTBF · 3-year warranty | New: $160.00 · Refurb: $154.00 | Recommended | - |
| Seagate | ST3000VX009 | 3.0 TB | 3.5" Surveillance HDD | 256 MB cache · 3-year warranty | New: $45.98 · Used: $98.00 | Recommended | CV11 |
| Seagate | ST3000VN006 | 3.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · 1000000 h MTBF · 3-year warranty | New: $288.30 | Recommended | SC60 |
| Toshiba | MG04ACA300E | 3.0 TB | 3.5" Enterprise HDD | - | New: $284.00 · Used: $59.99 | Recommended | FP4B |
| Seagate | ST2000VN004 | 2.0 TB | 3.5" NAS HDD | 5900 RPM · 64 MB cache · 1000000 h MTBF · 3-year warranty | New: $85.00 · Used: $96.48 | Recommended | - |
| HGST | HUS722T2TALA604 | 2.0 TB | 3.5" Enterprise HDD | - | New: $267.47 · Used: $84.99 | Recommended | RAGNWA07 |
| Seagate | ST2000VN003 | 2.0 TB | 3.5" NAS HDD | 5400 RPM · 256 MB cache · 1000000 h MTBF · 3-year warranty | New: $265.14 | Recommended | SC60 |
| Toshiba | MG04ACA200E | 2.0 TB | 3.5" Enterprise HDD | 3-year warranty | New: $602.11 · Refurb: $300.00 | Recommended | FP4B |
| Synology | HAT3300-2T | 2.0 TB | 3.5" NAS HDD | 3-year warranty | New: $578.21 · Used: $149.99 | Recommended | PL01 |
| Seagate | ST2000NE001 | 2.0 TB | 3.5" NAS HDD | 7200 RPM · 256 MB cache · 1200000 h MTBF · 5-year warranty | New: $374.47 | Recommended, EOL | EN01 |
| Seagate | ST2000NM001A | 2.0 TB | 3.5" Enterprise HDD | - | Refurb: $282.27 · Used: $84.95 | Recommended | SN02 |
| Synology | SAT5210-1920G | 1.92 TB | 2.5" Enterprise SSD | 5-year warranty | New: $999.99 | Recommended | SCEMH3.2 |
| Synology | SAT5220-1920G | 1.92 TB | 2.5" Enterprise SSD | - | No recent verified offer | Recommended | SCEMH5.0 |
| Synology | SAT5221-1920G | 1.92 TB | 2.5" Enterprise SSD | 5-year warranty | New: $2,200.01 · Refurb: $2,304.00 | Recommended | SCEM16.3 |
| Synology | SAT5200-1920G | 1.92 TB | 2.5" Enterprise SSD | - | No recent verified offer | Recommended | SCEMJ2.1 |
| HGST | HUS722T1TALA604 | 1.0 TB | 3.5" Enterprise HDD | - | Refurb: $204.88 · Used: $94.96 | Recommended | - |
| Seagate | ST1000VN008 | 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 | 1.0 TB | 3.5" NAS HDD | - | New: $123.00 · Used: $192.22 | Recommended | - |
| Synology | SAT5200-960G | 0.96 TB | 2.5" Enterprise SSD | - | Used: $75.00 | Recommended | SCEMJ2.1 |
| Synology | SAT5210-960G | 0.96 TB | 2.5" Enterprise SSD | 5-year warranty | No recent verified offer | Recommended | SCEMH3.2 |
| Synology | SAT5221-960G | 0.96 TB | 2.5" Enterprise SSD | 5-year warranty | New: $1,177.29 | Recommended | F3MN902 |
| Synology | SAT5220-960G | 0.96 TB | 2.5" Enterprise SSD | - | No recent verified offer | Recommended | SCEMH5.0 |
| Synology | SAT5210-480G | 0.48 TB | 2.5" Enterprise SSD | 5-year warranty | No recent verified offer | Recommended | SCEMH3.1 |
| Synology | SAT5220-480G | 0.48 TB | 2.5" Enterprise SSD | - | No recent verified offer | Recommended | SCEMH5.0 |
| Synology | SAT5221-480G | 0.48 TB | 2.5" Enterprise SSD | 5-year warranty | New: $1,069.91 | Recommended | F3MN902 |
| Synology | SAT5200-480G | 0.48 TB | 2.5" Enterprise SSD | - | 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 RS1221+. 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 |
|---|---|---|---|---|---|---|---|
| D4ECSO-2666-16G | 16 GB | DDR4 | ECC | SODIMM | 2666 MT/s | 5-year | Manufacturer source Checked 2026-09-16 |
| D4ES03-16G | 16 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 |
| D4ES01-8G | 8 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 |
| D4ES01-4G | 4 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 |
| D4ES04-4G | 4 GB | DDR4 | ECC | SODIMM | - | 5-year | Manufacturer source Checked 2026-09-16 |
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.