If you try to access data on an external USB hard drive, and you receive the following error:

USB Device not recognized: One of the devices attached to this computer has malfunctioned and windows does not recognize it

You may see KB2654149 to resolve this issue.

This issue can be caused if any of the following situations exist:
  • The currently loaded USB driver has become unstable or corrupt
  • Your PC requires an update for issues that may conflict with a USB external hard drive and Windows
  • Windows may be missing other important updates hardware or software issues
  • Your USB controllers may have become unstable or corrupt
  • Your external drive may be entering selective suspend
  • Your PC motherboard may need updated drivers.