Portable SSD Not Recognized? Fixes (2026)

Try the cable that came with the drive; many detection failures are under-spec cables. Test different USB-C ports, including ones directly on the machine rather than a hub. On Windows, open Disk Management to see if the drive appears uninitialized; on Mac, check Disk Utility. If it appears there but not in Explorer or Finder, it likely needs formatting or has a partition issue, not a hardware fault.

Confirm the port speed: a 1,050 MB/s drive on a 5 Gbps port caps around 500 MB/s, and USB 2.0 fallback gives roughly 40 MB/s. Replace hubs and adapters with direct connections for testing. On the Samsung T9 specifically, verify the port is Gen 2x2; on slower ports 1,000 MB/s is the expected ceiling, not a defect.

This is usually power or heat. Connect directly to the computer instead of an unpowered hub, since large transfers draw sustained power. Let a hot drive cool before retrying; sustained writes heat compact SSDs significantly. If disconnects persist on multiple ports and cables, back up what you can immediately and contact support.

Some difference is normal: manufacturers count a terabyte as 1,000 gigabytes while operating systems count 1,024, so a 1 TB drive shows about 931 GB. If the shortfall is much larger, check for hidden partitions in Disk Management or Disk Utility, or a fake-capacity counterfeit if the drive came from an unreliable seller.