Remember the files in the SanDisk SecureAccess folder are only accessible with SecureAccess on a Sandisk drive, so copying them to your computer won’t help. You need to open SecureAccess, on the SanDisk drive, and copy/move each individual decrypted file to the computer before deleting the files on the Sandisk drive.
For the security you mention it sounds like you need a Carbide USB drive.
