NAS Drive Compatibility

fnOS Official NAS Hardware: EVO2, EVO4, BASIC4, EVO4 PRO and the Beelink ME — Drive Bays, Drives and What Installs fnOS

Compatibility data on this site last refreshed 2026-11-03 · reading time ~3 min

Fnnas (广州铁刃智造) sells its own NAS hardware as well as the fnOS system you can install on DIY machines. As of late 2025 the official line-up is seven SKUs: the compact EVO2 and EVO4 (Intel N150), the conventional four-bay BASIC4, the RK3588 Arm version of the EVO4, the two EVO4 PRO models (AMD Ryzen 7 H 255 and Intel i5-13500H), and the all-flash Beelink ME mini built jointly with Beelink. All are preloaded with fnOS.

The line-up at a glance

Every model below supports both 2.5" and 3.5" SATA drives in its bay slots unless noted — bay size is not the differentiator; the CPU tier, drive bay count, SSD slots and networking are. Prices are mainland-China RRP in CNY.

2.5" vs 3.5": which drives actually fit

All SATA-bay models (EVO2, EVO4, BASIC4, both EVO4 PROs) accept 3.5" or 2.5" SATA drives — 3.5" drives screw into the tray, 2.5" uses dedicated mounting holes in the same tray. The RK3588 EVO4 follows the same four-SATA-bay layout. The Beelink ME mini is the opposite end: SSD-only, M.2 2280 PCIe 3.0 x1 slots, up to 4 TB per slot. There are no SAS bays, no M.2 in the N150 SKUs, and the EVO4 PRO's M.2 slots are PCIe 4.0 — SATA M.2 drives work in them but at 6 Gbps.

Does fnOS pick and choose your drives?

No official compatibility list — fnOS is not a drive whitelist, so any SATA/SSD drive your board detects can build pools. But the hardware line-up ships official drive bundles: the RK3588 EVO4 was launched with 4/8/16/32/64 TB Toshiba and Seagate HDD bundles, and the 32 TB-per-bay ratings on the EVO4 PROs are the practical ceiling. For the SATA models, treat the drive choice the same way as for the four HCL vendors we track: NAS-class or enterprise-class CMR drives with a rated workload, sized against the per-bay ceiling (32 TB PRO, 144 TB aggregate on the EVO4). For the ME mini, any M.2 2280 PCIe 3.0 NVMe up to 4 TB.

fnOS installation: minimum requirements

Sensible default configurations

For DIY x86 boxes running fnOS, our drive guides for the four official HCL vendors remain the best proxy: the same NAS-class drives Fnnas bundles are the ones the Synology, QNAP, Asustor and TerraMaster lists favor.

Quick answers

What official NAS hardware does Fnnas (飞牛) make?

Seven SKUs: EVO2 (2-bay), EVO4 (4-bay N150), BASIC4 (4-bay classic chassis), EVO4 RK3588 (Arm), EVO4 PRO in AMD H255 and Intel 13500H versions (4-bay 10GbE flags), and the all-flash Beelink ME mini (6x M.2). All ship with fnOS preinstalled.

Do Fnnas NAS devices take 2.5" or 3.5" drives?

All SATA-bay models (EVO2, EVO4, BASIC4, EVO4 PRO) take both 2.5" and 3.5" SATA drives in the same trays. The Beelink ME mini is SSD-only: M.2 2280 PCIe 3.0 slots, up to 4 TB each.

Are there SSD options inside Fnnas NAS units?

Yes. Every SKU has an M.2 NVMe system drive (typically 128 GB). The EVO4 PRO adds four M.2 2280 PCIe 4.0 storage slots supporting SSD RAID 0/1/5 (up to 8 TB per module). The RK3588 EVO4 has dual M.2 plus four SATA bays. The ME mini is 100% SSD storage.

Does fnOS have a hard drive compatibility list?

No. fnOS has no drive whitelist — any drive the hardware detects can build pools. Fnnas does sell official HDD bundles (Toshiba/Seagate 4-64 TB on the RK3588 EVO4), which double as the vendor-blessed choices.

What is the minimum disk for installing fnOS?

The system installs to a single drive. Minimum is 8 GB; the official installer recommends a 64 GB system partition where the disk allows. Use an SSD for the system disk, keep it separate from your storage pool, and install over wired network (Wi-Fi-only installs are not supported yet).

Check your exact model

Compatibility is per machine and per part number. Pick your model for its full official drive list:

Synology DS923+Full HCL →Synology DS224+Full HCL →Synology DS1522+Full HCL →Synology DS1821+Full HCL →Synology DS423+Full HCL →

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