The ASUSTOR Xpanstor 4 docking station connects via USB 3.2 Gen 2 Type-C and expands the capacity of a compatible NAS. It supports MyArchive for accessing cold-storage drives and scheduling backups. Smart power synchronization helps save energy, while the smart fan monitors the temperature.

It supports hot-swappable drives and multiple volumes, as well as RAID-level migration and RAID capacity expansion. Drives in the expansion unit cannot be combined with NAS drives in the same RAID array.

• Drive bays: 4
• Drive types: 2.5" and 3.5" HDDs and SSDs
• Drive interface: SATA3 6 Gb/s
• Connection: USB 3.2 Gen 2 Type-C
• Transfer speed: up to 10 Gbps
• Maximum capacity: 22 TB per drive
• Internal drive file systems: EXT4, Btrfs
• Volume types: Single, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10
• Fan size: 120 mm
• Power supply: 90 W
• Input voltage: 100–240 V AC
• Operating power consumption: 24.68 W
• Drive hibernation power consumption: 6.02 W
• Operating temperature: 0–40 °C
• Operating humidity: 5–95% RH
• Dimensions: 174 × 170 × 230 mm
• Weight: 2.03 kg
• Compatibility: AS31, 32, 40, 61, 62, 63, 64, Nimbustor, Nimbustor Gen2, Drivestor, Drivestor Pro, Drivestor Lite, Drivestor Pro Gen2, Lockerstor, Lockerstor Gen2, Lockerstor Pro, Flashstor