Command Information
The two low bits of the
command byte are used to indicate one of three possible actions:
Bits
00
Revert
to building the BIOS Parameter Block (BPB) off the medium for all subsequent
Build BPB functions. This is used after a format operation to reset the
device parameters to their original state.
01
Change
the default BPB for the physical device. This changes the physical parameters
for the drive as opposed to parameters for the media in the
drive.
10
Change the BPB
for the medium to the specified BPB, and return the new BPB for the medium
for all subsequent Build BPB calls. This is used to prepare the device
for a format media operation according to the device parameters specified.
All other bits are reserved, and must be set to
0.
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