Seagate Exos X18 16TB vs Seagate IronWolf Pro HDD 16TB
On the measures that settle this, Seagate Exos X18 16TB never comes out behind, and on at least one it comes out ahead.
| Specification | SeagateExos X18 16TB | SeagateIronWolf Pro HDD 16TB |
|---|---|---|
| Capacity (GB) | 16000 | 16000 |
| Current best price | £492.00betterat Amazon.co.uk · captured 2026-09-04 | £528.89at Amazon.co.uk · captured 2026-09-13 |
| Price per TB | £30.75better | £33.06 |
| RPM | 7200 | 7200 |
| Cache (MB) | 256 | 256 |
| Form factor | 3.5-inch | 3.5-inch |
| Warranty (years) | 5 | 5 |
How these two compare
Sequential throughput
Seagate Exos X18 16TB is rated 270 MB/s read and 270 MB/s write; Seagate IronWolf Pro HDD 16TB is 270 MB/s read and 270 MB/s write — level on the read figure vendors headline. On a mechanical drive the two directions track closely anyway, since platter speed and data density set the rate rather than the direction.
Price
Seagate Exos X18 16TB lists at £492.00, or £30.75 per TB; Seagate IronWolf Pro HDD 16TB at £528.89, or £33.06 per TB.
Spindle speed
Both turn at 7200 RPM. Spindle speed sets how quickly the head reaches data and how much power and noise the drive makes, and at an identical RPM the two land in the same place on all of it.
Cache
Seagate Exos X18 16TB carries 256 MB of onboard cache and Seagate IronWolf Pro HDD 16TB carries 256 MB — the buffer the drive uses to absorb bursts of writes and hold recently read data, smoothing over the mechanical delay of moving the head. More cache helps most under bursty, mixed workloads; for one long sequential transfer it barely matters.
Warranty
Seagate Exos X18 16TB carries a 5-year warranty and Seagate IronWolf Pro HDD 16TB a 5-year one — how long the maker will replace a failed drive, and a rough read on the confidence it has in the mechanism.
Which to buy
Seagate Exos X18 16TB. It gives up nothing to the other on the measures the site tracks and leads on at least one, so there is no trade to weigh — the sections above show where the margin is.
Common questions about this pair
- Which is faster, Seagate Exos X18 16TB or Seagate IronWolf Pro HDD 16TB?
- Seagate Exos X18 16TB is rated 270 MB/s read and 270 MB/s write; Seagate IronWolf Pro HDD 16TB is 270 MB/s read and 270 MB/s write — level on the read figure vendors headline. On a mechanical drive the two directions track closely anyway, since platter speed and data density set the rate rather than the direction.
- Which costs less per terabyte, Seagate Exos X18 16TB or Seagate IronWolf Pro HDD 16TB?
- Seagate Exos X18 16TB lists at £492.00, or £30.75 per TB; Seagate IronWolf Pro HDD 16TB at £528.89, or £33.06 per TB.
- Should you buy Seagate Exos X18 16TB or Seagate IronWolf Pro HDD 16TB?
- Seagate Exos X18 16TB. It gives up nothing to the other on the measures the site tracks and leads on at least one, so there is no trade to weigh — the sections above show where the margin is.