## Physical Device Driver Reference

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### 12h, 13h - Remarks

On entry, the unit code contains the unit number of the drive for which this operation is to be performed. The physical device driver must perform the following actions:

For GET, it must return the logical drive that is mapped onto the physical drive indicated by the unit number in the request header.

For SET, it must map the logical drive represented by the unit number onto the physical drive that has the mapping of logical drives.

The logical drive is returned in the unit code field. This field is set to 0 if there is only one logical drive mapped onto the physical drive.

Set the status WORD in the request header.