SanDisk SecureAccess 2.0

Did what you said except I didn’t erase everything on the flash drive.  Just erased Locker 1.0 and the Vault file thinking that would free up the space.  It’s still in my Mac trash so in theory it could be reinstalled on the flash drive.   Tried that and it copied back to the USB flash drive and it looks like My Vault is the right size but it thinks its a new installation.  Poking around the flash drive it looks like the files might be in the Locker.  I counted 23 files but the drive says 24 files.  Interesting, maybe all is not lost but just hiding.