Seagate · Data-centre drive · ST14000NM000J
Seagate Exos X18 14TB
Seagate builds this one for data-centre racks; in a home NAS it's simply a big 7,200 rpm SATA drive with five years' cover.
- Capacity
- 14 TB
- Recording
- CMR
- Speed
- 7,200 rpm
- Warranty
- 5 years
- Workload
- 550 TB/yr
- Failure rate
- AFR 1.83% average
Good for
- Busy arrays (550 TB a year)
- Big media libraries
- RAID, SHR and ZFS rebuilds
- 5 years' warranty
Not for
- A desk or bedroom (7,200 rpm is the louder class)
Updated 27 Oct 2026 · Method 2.0
Should you buy the Exos X18 14 TB?
Pick it for raw capacity in a box that lives out of earshot, because 7,200 rpm enterprise drives are built to run flat out all day, every day. Five years of warranty is the other draw, and on a drive you'll leave spinning for most of a decade that's worth having. It's CMR, which is what you want anywhere near a RAID or ZFS rebuild.
Watch out for
Being 7,200 rpm, it's in the noisier, warmer class of drive, and you'll want it somewhere you don't sit.
Backblaze has it at 1.83% lifetime AFR (0.97% to 3.13%), and that range takes in the 1.38% median. Call it middle of the pack. Seagate's datasheet puts it at 28 dB idle and 32 dB seeking. Power draw is 4.9 W idle on Seagate's figures, or 43 kWh a year if it spends the whole year idling. Put four in RAID 5 and you'll have 42 TB to fill (Windows will call it 38.2 TB).
Specifications
Each value links to the Seagate page or datasheet it came from.
Sources: seagate.com
Failure rate
Backblaze has 496 of them in service as ST14000NM000J. They've clocked up 710 drive-years between them and 13 have died, which puts the lifetime AFR at 1.83% (95% interval 0.97% to 3.13%, a range wide enough to include the 1.38% median).
Median lifetime AFR across Backblaze drive models: 1.38%
Source: Backblaze Drive Stats, lifetime to Q2 2026. Bear in mind that's data-centre use, which is a lot harder on a drive than a home NAS will ever be.