Western Digital Ultrastar DC HC520 12TB
Enterprise HDD
Part number HUH721212AL5200 - 0F29530 · Ultrastar DC HC520 series · 3.5" SAS HDD. If your machine is listed below, this drive is officially supported — not a forum workaround.
Part of the Western Digital Ultrastar DC HC520 series →
Check HUH721212AL5200 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 3 machines and series — 3 Synology. 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 12 TB capacity, ranked by how many machines list them:
Quick answers
Is the HUH721212AL5200 - 0F29530 officially compatible with my NAS?
It appears on the official compatibility lists of 3 machines and series — 3 Synology. Every machine page linked below shows the vendor's own list entry, refreshed daily.
Is the HUH721212AL5200 - 0F29530 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 HUH721212AL5200 - 0F29530 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 HUH721212AL5200 - 0F29530?
At the same capacity, the most widely listed alternatives are Western Digital WD121KRYZ (381 machines), Toshiba MG07ACA12TE (329 machines), Seagate ST12000NM0008 (315 machines). The full ranked list is below.