Compare NAS by drive-bay count
Bay count is the first buying decision — it sets your RAID options, your capacity ceiling and your budget band. Each page below lists every model at that bay count across Synology, QNAP, TerraMaster, UGREEN and UniFi in one ranked table, with CPU/RAM where published and each machine's official drive-list depth — plus the drives the most models in that class share.
Desktop classes
Small-business & rack classes
Enterprise racks
Why bay count drives everything else
One or two bays means mirroring at best (RAID 1) — capacity equals your smallest drive, and an unmirrored single bay has zero fault tolerance. Four bays is where RAID 5 arrives: one drive of parity, three of usable space. Six to eight bays justifies RAID 6 — two parity drives — because array rebuilds get long enough that a second failure during rebuild becomes a real risk. Twelve bays and up is rack territory, enterprise drives, and buy-what-the-vendor-lists discipline. Every class page carries this logic through to the actual drives, ranked by how many machines in that class officially list them.