DATA-CENTRE 20TB 7200 RPM · CMR WUH722020CLE6L4
Western Digital · Data-centre drive · WUH722020CLE6L4
WD Ultrastar DC HC555 20TB An enterprise drive. Don't let that put you off, as it's the same 3.5in SATA as a NAS drive and fits the same bays.
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Capacity 20 TB
Recording CMR
Speed 7,200 rpm
Warranty 5 years
Workload 550 TB/yr
Failure rate No failure data Sizes 12 TB 14 TB 16 TB 18 TB 20 TB Good for Busy arrays (550 TB a year) Big media libraries RAID, SHR and ZFS rebuilds 5 years' warranty Not for A desk or bedroom (7,200 rpm is the louder class) Updated 27 Oct 2026 · Method 2.0
Who the WD Ultrastar DC HC555 20 TB is for Pick it for raw capacity in a box that lives out of earshot, because 7,200 rpm enterprise drives are built to run flat out all day, every day. Five years of warranty is the other draw, and on a drive you'll leave spinning for most of a decade that's worth having. CMR, thankfully. SMR and parity rebuilds don't get on.
! Watch out forIt's a 7,200 rpm drive and you'll hear it working.
There's no Backblaze data worth quoting here. On paper it makes 20 dB at idle and 32 dB seeking. WD lists 5.3 W at idle and 6.4 W working, which comes to 46 kWh a year for a drive that idles around the clock. Four of them in SHR or RAID 5 give 60 TB usable, or 54.6 TB once Windows has done its binary maths on it.
WD Ultrastar DC HC555 20TB specifications Drive type Data centre source for Drive type (documents.westerndigital.com, opens in new tab) Capacity 20 TB source for Capacity (documents.westerndigital.com, opens in new tab) Spindle speed 7,200 rpm source for Spindle speed (documents.westerndigital.com, opens in new tab) Recording technology CMR source for Recording technology (documents.westerndigital.com, opens in new tab) Cache 512 MB source for Cache (documents.westerndigital.com, opens in new tab) Interface SATA 6Gb/s source for Interface (documents.westerndigital.com, opens in new tab) Form factor 3.5in source for Form factor (documents.westerndigital.com, opens in new tab) Max sustained transfer 285 MB/s source for Max sustained transfer (documents.westerndigital.com, opens in new tab) Workload rating 550 TB/yr source for Workload rating (westerndigital.com, opens in new tab) MTBF / MTTF 2,500,000 hours source for MTBF / MTTF (documents.westerndigital.com, opens in new tab) Maker's rated AFR 0.35% source for Maker's rated AFR (documents.westerndigital.com, opens in new tab) Warranty 5 years source for Warranty (documents.westerndigital.com, opens in new tab) Power at idle 5.3 W source for Power at idle (documents.westerndigital.com, opens in new tab) Power in use 6.4 W source for Power in use (documents.westerndigital.com, opens in new tab) Noise at idle 20 dB source for Noise at idle (documents.westerndigital.com, opens in new tab) Noise when seeking 32 dB source for Noise when seeking (documents.westerndigital.com, opens in new tab)
Sources: documents.westerndigital.com , westerndigital.com