Written 22 Aug 2026. Specs from the maker pages linked below. Prices from those stores. I haven't used these. Confirm the diskless SKU before you click: Amazon is full of drive bundles.
32 GB 4-bay for Docker or TrueNAS: TerraMaster F4-424 Pro
4-bay with an i3-N305 and 32 GB. TOS in the box. x86 people actually re-image it. Not a TrueNAS Mini X+ purchase path.
Official spec: Intel Core i3-N305 (8C/8T, burst 3.8 GHz), 32 GB DDR5 non-ECC in one slot, officially not upgradable past 32 GB, dual 2.5GbE with LACP, dual M.2 2280 NVMe (PCIe 3.0 x1), four SATA, HDMI 2.0b, two USB 3.2 Gen 2 10 Gbps. 90 W brick. 2-year warranty. 222 × 179 × 154 mm. Official power with four Seagate 4 TB ST4000VN008: 33.0 W read/write, 13.0 W hibernation. Noise claim 21.0 dB(A) standby. Dual 2.5GbE LACP “linear transfer speeds up to 283 MB/s” is TerraMaster’s number (they have also cited that figure on 4× 18 TB RAID 0). Maker claim. I didn't run iperf.
Non-ECC RAM, say that. 32 GB soldered-in-practice is the pitch versus every 2–6 GB Plus box. TOS runs out of the box. The board is x86, and people put TrueNAS or Unraid on it. I haven't re-imaged one. That is a community path, not a Labthrift burn-in.
iXsystems TrueNAS Mini X+ is the ECC / 10GBase-T comparison, not the CTA. Official product is real: C3758, 32 GB ECC, 5× 3.5" + 2× 2.5", dual 10GBase-T, buy path is the iXsystems configurator (USA/Canada). A 2026 TrueNAS forum report put the US configurator around $1909 diskless. Historical Amazon ASIN B08FCWBVWX is not a stable buy link. Don't treat Mini as the hero SKU on this page.
Drives stay CMR. Skip EFAX / EZAZ / BarraCuda 3.5" 4 / 8 TB SMR. IronWolf 1–6 TB is 5400 RPM: the 4 TB IronWolfs in TerraMaster’s own power test are that class. For a ZFS pool you still want CMR; 7200 helps more than the badge. HDD picks. Appliance vs re-image: DIY vs appliance.
Street, 22 Aug 2026
| Path | Listing | Note |
|---|---|---|
| TerraMaster store, diskless | $730.99 (listed $859.99) on 22 Aug 2026. Comparison table on the F2-425 page matches $730.99. | terra-master.com/products/f4-424-pro. nashq PDF cited $699.99 class. Datacenterdisk $687.99. Confirm live. |
| Amazon diskless | ASIN B0CPPD51B9 | B0CPPD51B9. |
| Newegg | 14P-006A-00066 | Official-store diskless only. |
| Mini X+ (comparison) | iX configurator; forum 2026 ~$1909 diskless | truenas.com/truenas-mini. Not the buy button. |
Skip
Skip if you need ECC and a supported TrueNAS appliance: that is Mini, and it is a different budget. Skip if you wanted 10G onboard; this is dual 2.5G. Skip if TOS-or-bust is a worse Sunday than DSM. Skip SMR in ZFS. Skip a used LSI HBA scavenger hunt as the “cheaper” DIY; that is not a first backup box.
Sources
TerraMaster F4-424 Pro spec page (i3-N305, 32 GB DDR5 non-ECC, 33 / 13 W, 283 MB/s, $730.99, fetched 22 Aug 2026). Amazon B0CPPD51B9. iXsystems Mini page. TrueNAS forum, 2026, US configurator $1909. I haven't installed TrueNAS on one.