if this is a hard disk partition related issues depends on what file system you are running to get a good solution in place.
if its fat32 , its much easier to diagnose and repair
if its ntfs
u can only do a chkdsk /f perhaps from recovery console or perhaps if you have the resources use a winternals bootdisk (CDISO) and then tinker about.
without an exact error i cant be of any more help
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