Western Digital 400GB
Enterprise HDD
Part number WD4000YS · 3.5" SATA HDD. If your machine is listed below, this drive is officially supported — not a forum workaround.
Check WD4000YS price on Amazon partner link
No series-level recording rating is on file for this part number yet — check the exact model for CMR vs SMR before buying it as a large cold copy (SMR is the one trait that makes a 16 TB+ backup copy painfully slow). The 3-2-1 guide and the backup tools encyclopedia cover what to schedule it with.
Compatibility verdict
It appears on the official compatibility lists of 89 machines and series — 81 Synology, 8 QNAP. This is a Enterprise-class drive: rated for heavier sustained workloads than desktop drives. It is a strong pick for a NAS running 24/7, large-array rebuilds or camera workloads, and enterprise lines are also the drives most widely listed across all five vendors' HCLs. No series-level recording rating is on file for this part number yet, so check CMR vs SMR on the exact model before buying for an array.
Compatible NAS models
Same-capacity alternatives
Other drives listed at 400 GB capacity, ranked by how many machines list them:
Quick answers
Is the WD4000YS officially compatible with my NAS?
It appears on the official compatibility lists of 89 machines and series — 81 Synology, 8 QNAP. Every machine page linked below shows the vendor's own list entry, refreshed daily.
Is the WD4000YS a good NAS drive?
This is a Enterprise-class drive: rated for heavier sustained workloads than desktop drives. It is a strong pick for a NAS running 24/7, large-array rebuilds or camera workloads, and enterprise lines are also the drives most widely listed across all five vendors' HCLs. No series-level recording rating is on file for this part number yet, so check CMR vs SMR on the exact model before buying for an array.
Can I use the WD4000YS for a 3-2-1 cold backup copy?
No series-level recording rating is on file for this part number yet — check the exact model for CMR vs SMR before buying it as a large cold copy (SMR is the one trait that makes a 16 TB+ backup copy painfully slow). The 3-2-1 guide and the backup tools encyclopedia cover what to schedule it with.
What are alternatives to the WD4000YS?
At the same capacity, the most widely listed alternatives are Intel SSDSC2BA400G4 (130 machines), Intel SSDSC2BX400G4 (111 machines), Intel SSDSC2BA400G3 (102 machines). The full ranked list is below.