I have a SanDisk USB Keychain drive and a laptop hard drive in a generic USB enclosure.<BR>I'm running XP Pro SP1.<BR><BR>The last few months neither drive will show up in My Computer or Explorer ...

After plugging the USB Pen drive to your PC, if files, folders & data are not visible on the USB, then these suggestions are sure to help you.

If your USB flash drive is not copying files, format your file type to NTFS. However, you may also need to gain administrator permission to fix the issue.