Problem
The computer does not recognize a connected external hard drive.
Symptoms
Drive does not appear in File Explorer or Finder.
Drive is not listed in Disk Management.
Drive light turns on, but no data connection is made.
Error message stating the device is not recognized.
Possible Causes
Faulty USB cable or port.
Corrupted or unassigned drive letter.
Outdated USB or drive drivers.
Drive requires more power than the port provides.
Drive failure.
Resolution
Step 1
Try a different USB cable and port.
Step 2
Check Disk Management to see if the drive is detected but not showing.
Step 3
Assign a drive letter manually if missing.
Step 4
Test the drive on another computer.
Step 5
Update USB and storage drivers.
Step 6
If the drive uses a separate power adapter, ensure it is connected.
Prevention
Safely eject external drives before disconnecting.
Use quality cables and powered USB hubs for large drives.
Back up data regularly in case of drive failure.
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