Fix a portable SSD that is not recognized, not showing in File Explorer, missing from Disk Management, not detected on Mac, and slow or disconnecting mid-transfer. Works for Samsung T7, SanDisk Extre
Work through these in order, the most common causes come first.
The fastest way to narrow down the cause is to check three tools in sequence.
Do this before working through the full fix list, it will tell you which fixes are relevant.
Step 1, Device Manager (Windows) or System Information (Mac): check whether the computer sees the drive at the hardware level.
On Windows: open Device Manager (Win+X > Device Manager) and look under Disk Drives.
On Mac: Apple menu > About This Mac > System Report > USB.
Work through Fixes 1-7 before concluding hardware failure.
If the drive has failed and contains data you need: Free options: TestDisk (open source, partition table recovery), Recuva (Windows, free version), PhotoRec (file carving by type).
These handle logical failures, corrupt partition tables, accidental formatting, filesystem errors.
Professional data recovery: DriveSavers, Ontrack, Gillware.
These handle physical failures w here the drive cannot be detected at all.
A professional lab can sometimes recover data from SSDs w here the flash chips are intact but the controller has failed.
Our picks
As an Amazon Associate I earn from qualifying purchases. Picks are based on manufacturer specs, independent reviews and owner reports.
Crucial
2 Gen 2x2 SSD rated up to 2,100MB/s reads and 2,000MB/s writes, with IP55 protection.
SanDisk
IP55 rated, survives accidental water exposure and dust in field use
Lexar
A slim Gen 2x2 SSD rated up to 2,000MB/s, compatible with iPhone 15 Pro ProRes recording.
FAQ
If the drive stopped working after an OS update: check for a firmware update for the SSD from the manufacturer. Windows and macOS updates occasionally change USB driver behavior that affects drive recognition. If the drive stopped working after a specific event (drop, water exposure): the drive likely has physical damage. If the drive stopped working with no apparent event: cable failure is the most likely cause, replace the cable.
A drive in Device Manager but not File Explorer has no assigned drive letter or no formatted filesystem. Open Disk Management and check the drive's status: if unallocated, create a new partition. If a partition exists with no letter, assign a drive letter. If the drive shows as RAW, use data recovery software before reformatting.
Flash memory cells have a finite number of write cycles. Physical damage from drops or water can cause permanent hardware failure. Controller failures (the chip that manages the SSD) can cause the drive to stop responding entirely. Always mainta in at least one additional backup copy of important data, a single drive backup is one failure away from data loss.
Check in Disk Management or Disk Utility. If the drive appears in Disk Management as RAW or Unallocated, the hardware is functional and data recovery or reformatting is possible. If the drive does not appear in Disk Management at all even though Device Manager shows it: the drive's partition table is corrupted, use a partition recovery tool (TestDisk, free). If the drive does not appear anyw here even after cable and port swaps: the hardware has likely failed.
Keep researching
