## Physical Device Driver Reference

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### DSK_GETDEVICEPARAMS (63h) - Command Information

Command Information A byte with bit 0 defined as follows:

0 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.
1 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.