Seagate IronWolf Pro HDD 12TB vs Western Digital WD Purple Pro HDD 12TB
Seagate IronWolf Pro HDD 12TB is at least the equal of the other on every measure that decides this, and ahead on at least one.
| Specification | SeagateIronWolf Pro HDD 12TB | Western DigitalWD Purple Pro HDD 12TB |
|---|---|---|
| Capacity (GB) | 12000 | 12000 |
| Current best price | $459.99betterat Amazon.com · captured 2026-09-04 | $635.00at Amazon.com · captured 2026-09-09 |
| Price per TB | $38.33better | $52.92 |
| RPM | 7200 | 7200 |
| Cache (MB) | 256 | 512better |
| Form factor | 3.5-inch | 3.5-inch |
| Warranty (years) | 5 | 5 |
How these two compare
Sequential throughput
Seagate IronWolf Pro HDD 12TB is rated 270 MB/s read and 270 MB/s write; Western Digital WD Purple Pro HDD 12TB, 267 MB/s read and 267 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 Seagate IronWolf Pro HDD 12TB carries the higher one.
Price
Seagate IronWolf Pro HDD 12TB is $459.99 ($38.33 per TB); Western Digital WD Purple Pro HDD 12TB is $635.00 ($52.92 per TB).
Spindle speed
Seagate IronWolf Pro HDD 12TB and Western Digital WD Purple Pro HDD 12TB both spin at 7200 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
Seagate IronWolf Pro HDD 12TB ships with 256 MB of cache built in, Western Digital WD Purple Pro HDD 12TB with 512 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
Seagate IronWolf Pro HDD 12TB is warranted for 5 years, Western Digital WD Purple Pro HDD 12TB for 5. 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
Against the other, Seagate IronWolf Pro HDD 12TB is even or ahead on every tracked measure and behind on none, the one case where the choice needs no compromise.
Common questions about this pair
- Which is faster, Seagate IronWolf Pro HDD 12TB or Western Digital WD Purple Pro HDD 12TB?
- Seagate IronWolf Pro HDD 12TB is rated 270 MB/s read and 270 MB/s write; Western Digital WD Purple Pro HDD 12TB, 267 MB/s read and 267 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 Seagate IronWolf Pro HDD 12TB carries the higher one.
- Which costs less per terabyte, Seagate IronWolf Pro HDD 12TB or Western Digital WD Purple Pro HDD 12TB?
- Seagate IronWolf Pro HDD 12TB is $459.99 ($38.33 per TB); Western Digital WD Purple Pro HDD 12TB is $635.00 ($52.92 per TB).
- Should you buy Seagate IronWolf Pro HDD 12TB or Western Digital WD Purple Pro HDD 12TB?
- Against the other, Seagate IronWolf Pro HDD 12TB is even or ahead on every tracked measure and behind on none, the one case where the choice needs no compromise.