fnOS (Fnnas) official hardware
Unlike the five HCL vendors on this site, fnOS is a software platform — you can run it on your own x86 box or buy one of Fnnas\' own machines with it preloaded. The official line is small but real, and it is the reference point for "which drives fit".
The official machines
| Machine | What it is | Drive fit |
|---|---|---|
| EVO2 | 2-bay desktop, fnOS-tuned, entry point to the ecosystem | Standard SATA 3.5"/2.5" bays; size cap per the current line |
| EVO4 | 4-bay desktop, the mainstream fnOS home box | Standard SATA 3.5"/2.5" bays; size cap per the current line |
| EVO4 PRO | 4-bay performance tier with stronger CPU and SSD RAID options | Standard SATA 3.5"/2.5" bays; size cap per the current line |
| BASIC4 | Value 4-bay tower — the cheapest route to fnOS | Standard SATA 3.5"/2.5" bays; size cap per the current line |
| ME mini (with Beelink) | All-flash ~100 mm cube: M.2 slots only, no 3.5" bays — a different beast | M.2 / SSD only — no 3.5" bays |
Exact capacities, RAM and controller details are on the official Fnnas store ↗ — they change with each model revision.
What to buy it with
Because fnOS has no whitelist, the hardware choice does the heavy lifting. Match the machine to the drives on our fnOS drive picks: CMR NAS/enterprise drives for the pool, a small SSD for the system partition (details on system & cache setup), and a second drive kept offline for a 3-2-1 copy. Verify any part number in the SMR/CMR checker before you buy.
fnOS vs the hardware vendors
Facing a Synology, QNAP or TerraMaster instead? Compare the official machines against the big five in our 2-bay and 4-bay cross-vendor comparisons — same drives, different OS and price.