Symptoms
- Drive doesn't appear in File Explorer or Finder
- No spin-up sound or vibration when plugged in
- Drive shows in Disk Management but has no letter
- Works on one computer but not another
- Computer plays a USB connect sound but nothing opens
Likely causes
- CommonLoose or faulty USB cableCables fail internally with no visible damage.
- CommonPort not supplying enough powerSome bus-powered drives need a full USB 3.0 port, not a hub or front panel.
- CommonDrive has no assigned letter or is unallocatedWindows can see the hardware without mounting it as a usable drive.
- PossibleOutdated USB or storage driverA stale driver can stop a working drive from mounting.
- Less commonDrive electronics have failedAge and drops eventually kill the drive's internal controller.
What to do
- Try a different USB cable and plug directly into the computer instead of a hub or dock.
- On a desktop, use a rear port on the motherboard rather than a front-panel port.
- Open Disk Management (Windows) or Disk Utility (Mac) to see if the drive appears without a letter or volume name.
- If it appears there, right-click and assign a drive letter or mount it.
- Test the drive on a second computer to tell whether the drive or the original PC is the problem.
- Check Device Manager for a warning icon on the drive or USB controller and update the driver.
- If the drive is silent and invisible everywhere, it likely needs professional recovery.
Tools and parts
- Spare USB cable
USB 3.0 cableSearch: “USB 3.0 type A to micro-B or C cable”
When to call a pro
If important data is on a drive that won't mount anywhere, stop repeated attempts and send it to a data recovery service before more damage occurs.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.