## Physical Device Driver Reference

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### CDROMDISK_GETHEADLOC (70h) - Returns

The error return codes for this function are as follows:

02h Device not ready: The drive is not ready, or the controller does not respond.

07h Unknown Media: The media is a compact disc that is not formatted according to the CD Redbook specification.

10h Uncertain media.

13h Unsupported parameter: The addressing mode is out of range or not supported, or the first 4 bytes of the parameter packet are not "Signature" .