3 Key Upgrades in the TerraMaster F4-423 Over the F4-421

  1. Two M.2 NVMe slots The F4-423 adds two M.2 NVMe slots that can be used for caching or as dedicated storage, a feature missing from the F4-421.

  2. Four SATA bays unchanged The four SATA bays still accept any mix of 3.5-inch and 2.5-inch drives, keeping the same flexible storage options as its predecessor.

  3. NVMe and SATA can coexist You can now run an NVMe storage pool alongside your SATA array, making this a meaningful generational step for mixed-speed workflows.

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