## Physical Device Driver Reference

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### DSK_SETDEVICEPARAMS (43h) - Command Information

Command Information The two low bits of the command byte are used to indicate one of three possible actions:

Bits Description

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.