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Built for a NAS bay: 24/7 duty cycle, vibration tolerance for multi-drive chassis, and firmware tuned for RAID rebuild behaviour.
| Capacity | 20.0 TB |
|---|---|
| Form factor | 3.5" |
| Type | HDD |
| Interface | SAS |
| Interface speed | SAS 12Gb/s |
| Series | Ultrastar DC HC555 |
| Class | NAS |
| Spindle speed | 7200 RPM |
| Cache | 512 MB source |
| Sequential read | 285 MB/s |
| Sequential write | 285 MB/s |
| Annual workload rating | 550 TB/year |
| MTBF | 2500000 hours |
| Warranty | 5 years source |
| Recording technology | CMR |
| Fill gas | Helium |
| Encryption | SED (unspecified) |
| Power, active | 9.2 W |
| Power, idle | 5.3 W |
| Operating temperature | 41 to 140 °F (5 to 60 °C) source |
| Noise, idle | 36 dBA |
| Height (z-height) | 1.03 in (26.1 mm) |
| Weight | 1.5 lb (689 g) |
| Released | 2021 |
| Vendor part numbers | WUH722020CL5204 |
Recently observed offers
New: $1,401.31 incl. listed shipping Checked 2026-11-04
Cheapest exact-model fixed-price listing found per condition (New, Refurbished, Used) -- shown only for conditions with a real match, checked within three days of this page build. Availability and shipping may change; confirm at the seller.
Certified on 2 QNAP NAS models
Show all 2 QNAP models
The certified list above comes from QNAP's published Hardware Compatibility List. Certification is the manufacturer's statement, not a test performed here.