Problem: Some devices can appear as multiple logical drive letters, depending on how they are partitioned. In some cases, they can emulate a 1.44-megabyte (MB) floppy disk drive and a memory storage drive. Therefore, Windows may assign the same device drive letters A and B for floppy disk emulation and F for the memory storage drive. By default, MDT scripts use the lowest drive letter (in this example, A).
Possible Solution: Override the default setting on the Specify the BitLocker recovery details page in the Windows Deployment Wizard. The Windows Deployment Wizard summary page displays a warning to inform the user which drive letter was selected to store BitLocker recovery information. In addition, the BDD.log and ZTIBDE.log files record the removable media devices detected and which device was selected to store the BitLocker recovery information.