DSM 7.3 third-party drive policy; verify exact MPN
DS925+ + 4 × 12TB IronWolf
A checked starting combination targeting about 24TB usable with shr-2 / raid 6-style dual-drive redundancy.
Lowest checked total$2,099.95B&H + Amazon
Lowest one-store total$2,204.68Amazon
Approx. usable24TB
Checked value$87.50/TB
What the bundle contains
Capacity and redundancy
The four-drive pool can continue after two drives fail; team data still needs snapshots, off-site backup, and restore tests.
Approximation: $(4 - 2) × 12TB = 24TB$. Filesystem formatting, system partitions, snapshots, and RAID implementation reduce displayed free space.