A three-drive SHR-style pool delivers about 24TB usable and leaves a bay open for planned growth.
Watch: DSM 7.3 restored third-party SATA support, but exact MPN compatibility remains a purchase-time check.
DSM 7.3 third-party drive policy; verify exact MPNCompare component stores →
DS925+ + 3 × 12TB IronWolf
A checked starting combination targeting about 24TB usable with shr / raid 5-style single-drive redundancy.
Price estimate — recheck required$1,864.96Amazon + Amazon
Price estimate — recheck required · one store$1,864.96Amazon
Approx. usable24TB
Price estimate — recheck required / TB$77.71/TB
At least one component price or stock record needs checking. Confirm store prices and availability; tax and shipping are extra.
NAS: recently observed · Oct 9, 2026. Drives: needs checking · Aug 30, 2026.
Prices exclude tax and shipping · checked Aug 30, 2026
Why this exact build
What the bundle contains
Capacity and redundancy
The three-drive pool can continue after one drive fails and leaves one bay open; RAID is not a backup.
Approximation: (3 − 1) × 12TB = 24TB. Filesystem formatting, system partitions, snapshots, and RAID implementation reduce displayed free space.