SURVEILLANCE 4TB 5400 RPM · CMR WD44PURZ
Western Digital · Surveillance drive · WD44PURZ
WD Purple 4TB A surveillance drive, made for CCTV recorders that write video all day, and WD gives it no NAS bay rating.
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That button opens an Amazon search for WD44PURZ, and searches throw up lookalikes, so the part number on the listing is the thing to check before you buy.
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Capacity 4 TB
Recording CMR
Speed 5,400 rpm
Warranty 3 years
Workload 180 TB/yr
Failure rate No failure data Sizes 1 TB 2 TB 3 TB 4 TB 6 TB 8 TB Good for A CCTV recorder (NVR or DVR) Not for A NAS (WD gives it no NAS rating) Heavy daily writes (180 TB a year rating) Updated 27 Oct 2026 · Method 2.0
Should you buy the WD Purple 4 TB? Got a CCTV box to fill? That's its home. It turns up when you sort everything by price per TB, which is why it's labelled here. In a NAS you'd be running it outside what WD rates it for, and for an array you want a drive that's rated for one.
! Watch out forWD doesn't rate it for NAS use at all, which rules it out for an array as far as we're concerned.
Backblaze doesn't run enough of these for a failure rate we'd publish.
WD Purple 4TB specifications Drive type Surveillance source for Drive type (documents.westerndigital.com, opens in new tab) Capacity 4 TB source for Capacity (westerndigital.com, opens in new tab) Spindle speed 5,400 rpm source for Spindle speed (westerndigital.com, opens in new tab) Speed class 5400 class source for Speed class (documents.westerndigital.com, opens in new tab) Recording technology CMR source for Recording technology (westerndigital.com, opens in new tab) Cache 128 MB source for Cache (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 (westerndigital.com, opens in new tab) Max sustained transfer 175 MB/s source for Max sustained transfer (westerndigital.com, opens in new tab) Workload rating 180 TB/yr source for Workload rating (westerndigital.com, opens in new tab) MTBF / MTTF 1,000,000 hours source for MTBF / MTTF (documents.westerndigital.com, opens in new tab) Warranty 3 years source for Warranty (westerndigital.com, opens in new tab)
Sources: westerndigital.com , documents.westerndigital.com