TerraMaster's new F4-425 Pro ships with TOS 7, the company's NAS operating system built on the Linux 6.12 kernel. The release adds natural language control through an OpenClaw AI assistant, smart ISO mounting that opens disc images on a double-click, a unified recycle bin, per-port bandwidth limits, and a reworked notification center. TerraMaster claims search accuracy improved by 120 percent and query speed jumped tenfold over the previous TOS 6 release. The catch for existing owners: the jump from TOS 6 to TOS 7 is a manual update rather than an automatic one.
The hardware is a four-bay, three-slot "4+3 hybrid" design pairing four SATA bays (up to 132TB total, 32TB per drive, with hot swapping) and three M.2 2280 NVMe slots on PCIe 3.0 x1 (up to 24TB). It comes in two configurations: an octa-core Intel Core i3-N305 "Alder Lake-N" chip at up to 3.8 GHz with 8GB of DDR5, or an octa-core Intel Core 3 N350 "Twin Lake" chip at up to 3.9 GHz with 16GB. The N350 is essentially a refresh of the N305 with marginally higher CPU and GPU clocks at a lower 7W TDP, so the real differentiator between the two models is the memory, expandable to 32GB either way. Both handle hardware transcoding for H.264, H.265, MPEG-4, and VC-1 up to 4K at 60 FPS.
Connectivity leans modern: dual 5GbE RJ45 ports with link aggregation, three USB 3.2 Type-A ports and one Type-C port all at 10 Gbps, and an HDMI 2.1 output that handles terminal access rather than media playback. The aluminum-alloy chassis measures 150 x 181 x 219 mm (5.9 x 7.1 x 8.6 inches) and weighs 2.9 kg (6.4 lbs), cooled by a 120mm smart fan rated at a quiet 20.9 dB(A) at one meter with drives idle. RAID options cover 0, 1, 5, 6, and 10 alongside JBOD and TerraMaster's own TRAID, with BTRFS and EXT4 for internal volumes.
Because this is standard Intel x86 silicon, the F4-425 Pro is not locked to TOS. The same Alder Lake-N and Twin Lake chips power a growing wave of DIY x86 NAS boards, and they run open-source storage operating systems like TrueNAS and OpenMediaVault without fuss, which is worth keeping in mind for anyone who would rather self-host on familiar Linux tooling than commit to a vendor stack. The Core i3-N305 is already a well-documented quantity in that scene, and the Core 3 N350 carries the same integrated graphics and platform support. TerraMaster's support staff actively encourage installing alternative operating systems such as TrueNAS, Unraid, and Xpenology on the F4-425 Pro. The internal USB bootloader is accessible after removing four screws from the outer shell, and switching to an alternative OS requires only a BIOS boot order change: disable "UTOS Boot First" in the Aptio setup and point Boot Option 1 at a USB drive. Community guides for TrueNAS on TerraMaster hardware already exist, including one covering the prior F4-425 and a full installation walkthrough from NAS Compares applicable to this hardware family.
TerraMaster lists the F4-425 Pro at $560 (€515) for the Core i3-N305 model with 8GB and $670 (€615) for the Core 3 N350 model with 16GB, both currently reflecting a time-limited 20 percent promotion. A 90W external adapter handles power. The company is also running a giveaway for four winners, each receiving an F4-425 Pro and a 4TB drive.
