Ghost 14.0 - Unable to dismount recovery point drives

After mounting a recovery point, I exited ghost (without dismounting using the recovery point browser). The drive letter used for the recovery point shows in Windows Explorer. Attempts to dismount the recovery point drive fail with the error: cannot retrieve drive information.

 

The drive letter is in use and a remount of the recovery point used another drive letter - ignoring the "apparent" availability of the original drive letter.

 

Any idea how I can "dismount" these drives that are not in use but show in Windows Explorer?

 

Jack

 

OS: XP SP3 - Backup Data on  HP One Touch 4 USB External Drive.