Return the recommended BPB for the drive, which is
the BPB for the physical device, unless it is a formatted fixed media. Then,
it is the BPB that was on the media when the system was booted.
Return the BPB for the media currently in the drive.
This always reads the BPB off the current media in the drive. An error
is returned if the media is unformatted.
All other bits are reserved, and must be set to 0.