my 8gb flex usb 2.0 drive shows in windows explorer, but will not mount or show files. after some time, the message comes back: "I/O device error. The driver is up to date.

After reformat (NTFS) shows 66 mb in use, 7.45 gb available, but no files or partitions, even when windows explorer is set to show all files and extensions.

windows 7 ultimate. laptop and desktop have same problem. works fine in safe mode. works if I uninstall and reinstall from administrative tools. Then will not work next time I insert (after safely ejecting). tried reassigning drive letter. no joy.