WD Purple Pro: 8TB to 26TB Models, 550TB Rating and Amazon.co.uk Prices

WD Purple Pro models and what WD's July 2025 sheet states

WD's July 2025 Purple Pro sheet covers eight models over two pages. The larger four are WD260PURP, WD241PURP, WD221PURP and WD181PURP, at 26, 24, 22 and 18TB. The smaller four are WD142PURP, WD122PURP, WD102PURP and WD8002PURP, at 14, 12, 10 and 8TB. WD states CMR recording for all eight and a 7200 RPM spindle across the range.

Across the range WD lists 32 AI streams per model, no maximum on drive bays and a workload rating of up to 550TB a year. No Limit on bays is WD's rating for the drive; the largest drive a recorder accepts is the recorder maker's figure, so take that from its manual.

The noise rows matter if the recorder sits in an office or at home, and they split along the air and helium line. The three quietest at idle are the helium 22TB, 18TB and 14TB, each at 20 dBA; the air-filled 10TB and 12TB idle at 34 dBA, the loudest pair. When seeking, the 22TB, 24TB and 26TB are the quietest at 32 dBA, and the 10TB and 12TB again the loudest at 39 dBA.

Choosing a WD Purple Pro capacity from the sheet

Every model shares the 550TB rating, the 32 AI streams and the five-year warranty, so capacity choice rests on what the sheet does separate. The 8TB is the only model with 256MB of cache; everything from 10TB up has 512MB. From 14TB up every model is helium, and those helium drives are quieter at idle than the air-filled 8TB, 10TB and 12TB.

A capacity appears in the table below only while an offer for it is in stock, and the table is capped and sorted by price per terabyte.

WD Purple Pro price on Amazon.co.uk

In all, the table draws on 8 listings in stock. The table shows 8 listings, from £25.76/TB, in pounds sterling inc VAT, with new and used offers marked.

Read the part number before you read the sheet. A Purple Pro listing may carry an older part number such as WD8001PURP, WD101PURP or WD121PURP, or a retail kit code such as WDBBBV0120HNC-WRSN. None of those is on the July 2025 sheet's model rows, so the figures above do not attach to them: WD101PURP, for example, is not the WD102PURP the sheet describes. The Recording column shows CMR for a row only where a WD document covers that row's part number or its family.

WD Purple Pro or Seagate SkyHawk AI

Seagate's SkyHawk AI is the direct comparison. Seagate rates it at 550TB a year, the same figure WD gives Purple Pro, and at up to 2.5M hours MTBF, with 2M hours on the 8TB and 10TB models; it calls that workload more than three times a standard surveillance drive, and says it supports up to 64 HD video streams and 32 AI streams. On workload and AI streams the two lines are rated alike, so the decision comes down to price per terabyte at the capacity you need and which part number your recorder's list names.

Seagate SkyHawk carries the SkyHawk AI part numbers and its own live table.

WD Purple Pro or standard WD Purple

WD rates its standard WD Purple AllFrame 4K models, the 1TB to 8TB configurations on its April 2019 sheet, at up to 180TB a year, and the AllFrame AI models WD121PURZ, WD101PURZ and WD82PURZ at 360TB. Purple Pro's 550TB is about three times the first figure and about half as much again as the second.

The higher figure is aimed at recorders that write a lot in a year. WD's camera-support figures assume one stream per camera at 3.2Mbps (1080p, H.265, 25 fps), and WD says results vary with resolution, format, frame rate and software. The CCTV storage calculator turns your own figures into a yearly write volume you can set against these ratings.

WD Purple Pro on Hikvision's compatibility list

Owners of Hikvision recorders will find WD122PURP, the 12TB Purple Pro, in a series table dated 15 May 2026 in the maker's v20260515 drive list. Rows are per recorder series, so check that your recorder's table carries the part number. Hikvision hard drive goes through the list in detail.