Western Digital WD Purple HDD 4TB vs Western Digital WD Red HDD 4TB
Neither Western Digital WD Purple HDD 4TB nor Western Digital WD Red HDD 4TB wins outright — each takes something the other gives up, so the pick is which of those you want.
| Specification | Western DigitalWD Purple HDD 4TB | Western DigitalWD Red HDD 4TB |
|---|---|---|
| Capacity (GB) | 4000 | 4000 |
| Current best price | £185.00betterat Amazon.co.uk · captured 2026-09-13 | £218.97at Amazon.co.uk · captured 2026-09-13 |
| Price per TB | £46.25better | £54.74 |
| RPM | 5400 | 5400 |
| Cache (MB) | 64 | 256better |
| Form factor | 3.5-inch | 3.5-inch |
| Warranty (years) | 3 | 3 |
How these two compare
Sequential throughput
Western Digital WD Purple HDD 4TB is rated 150 MB/s read and 150 MB/s write; Western Digital WD Red HDD 4TB, 180 MB/s read and 180 MB/s write. On a mechanical drive read and write track closely — platter speed and data density set the rate, not the direction — so it is the read figure that separates them, and Western Digital WD Red HDD 4TB carries the higher one.
Price
Western Digital WD Purple HDD 4TB is £185.00 (£46.25 per TB); Western Digital WD Red HDD 4TB is £218.97 (£54.74 per TB).
Spindle speed
Western Digital WD Purple HDD 4TB and Western Digital WD Red HDD 4TB both spin at 5400 RPM, so neither reaches data sooner than the other; at that shared speed the usual trade — quicker access against more power draw and noise — falls the same way for both.
Cache
Western Digital WD Purple HDD 4TB ships with 64 MB of cache built in, Western Digital WD Red HDD 4TB with 256 MB. The buffer lets the drive take in a burst of writes before the platter catches up and keeps recently read data close — useful under mixed, stop-start load, less so for a single large copy.
Warranty
Western Digital WD Purple HDD 4TB is warranted for 3 years, Western Digital WD Red HDD 4TB for 3. The cover is the maker's own commitment; a longer one usually signals a drive built for heavier duty, though it is the mechanism, not the paperwork, that has to last.
Which to buy
It comes down to which you value more: Western Digital WD Purple HDD 4TB and Western Digital WD Red HDD 4TB each lead the other somewhere the site tracks. Read the sections above for which edge — capacity, spindle speed, cache — fits your use.
Common questions about this pair
- Which is faster, Western Digital WD Purple HDD 4TB or Western Digital WD Red HDD 4TB?
- Western Digital WD Purple HDD 4TB is rated 150 MB/s read and 150 MB/s write; Western Digital WD Red HDD 4TB, 180 MB/s read and 180 MB/s write. On a mechanical drive read and write track closely — platter speed and data density set the rate, not the direction — so it is the read figure that separates them, and Western Digital WD Red HDD 4TB carries the higher one.
- Which costs less per terabyte, Western Digital WD Purple HDD 4TB or Western Digital WD Red HDD 4TB?
- Western Digital WD Purple HDD 4TB is £185.00 (£46.25 per TB); Western Digital WD Red HDD 4TB is £218.97 (£54.74 per TB).
- Should you buy Western Digital WD Purple HDD 4TB or Western Digital WD Red HDD 4TB?
- It comes down to which you value more: Western Digital WD Purple HDD 4TB and Western Digital WD Red HDD 4TB each lead the other somewhere the site tracks. Read the sections above for which edge — capacity, spindle speed, cache — fits your use.