If the USB hard drive can be detected in 'my computer' as a drive letter(like E: drive) but you can't access/open it,you can
recover data from USB hard drive with 3rd party data recovery program.
Tenorshare data recovery is a professional data recovery program that can recover data after deeply scanning your hard drive to look for lost data due to drives crash, physical damage,system sabotage, virus attack etc.Download it and scan your USB hard drive for free to preview whether your files can be recovered.You can get it here:
http://www.any-data-recovery.com/product/datarecoveryprofessional.htm After you recover your data,you can format it to check out whether it can be fixed.
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