## Physical Device Driver Reference

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### DSK_GETDEVICEPARAMS (63h) - Extended BPB for Device

Extended BPB for Device The physical device driver maintains two BPBs for each drive. One is the current BPB that corresponds to the media in the drive. The other is a recommended BPB based on the type of media that corresponds to the physical device. (For example, for a high-density drive , the BPB is for a 96 tracks-per-inch (TPI); for a low-density drive, the BPB is for a 48 TPI). The low bit of the Command Information field indicates which BPB the application needs to see.