External Hard Drive Not Recognised
A USB or external hard drive doesn't appear in File Explorer when connected, makes an unusual noise, or Windows shows a message that the device isn't recognised.
Quick answer: An external drive that isn't recognised is often a cable, port or power issue rather than the drive itself, especially with portable drives that draw power directly from the USB port. Try a different cable and port before assuming the worst.
Likely causes
- A faulty or underpowered USB cable or port, particularly common with portable drives on older or lower-powered ports
- The drive needs more power than a single USB port can supply (common with desktop external drives lacking their own power adapter)
- A driver conflict or corrupted drive letter assignment
- The drive itself has failed, particularly if it makes clicking or grinding noises
What you can safely check yourself
- Try a different USB cable and a different port, ideally directly on the computer rather than through a hub
- Check Disk Management to see whether the drive appears there even if File Explorer doesn't show it
- Try the drive on another computer if you have access to one, to help isolate whether it's the drive or your computer
If the drive makes any clicking, grinding or repetitive noise, stop trying different ports and cables — that points to a physical fault, and repeated connection attempts on a failing drive can reduce the chances of recovery.
When it needs a proper look
If a different cable, port and computer all fail to detect the drive, and there's noise or the drive was dropped or knocked, that's a hardware fault and, if the files matter, a job for data recovery rather than further troubleshooting.