hmmmm Try running a CHKDSK command on the drive, reboot, and see if that helps.
If not you can try replacing the SanDisk app on the drive. http://kb.sandisk.com/app/answers/detail/a_id/2399/related/1/kw/secureaccess/r_id/101834
hmmmm Try running a CHKDSK command on the drive, reboot, and see if that helps.
If not you can try replacing the SanDisk app on the drive. http://kb.sandisk.com/app/answers/detail/a_id/2399/related/1/kw/secureaccess/r_id/101834