## Storage Device Driver Reference

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### Category 08h Generic IOCtl Commands

The philosophy described above also applies to the disk generic IOCtl commands. For any logical block device of an associated extended volume, physical cylinder, head, and sector I/O is mapped to within the extended volume - Cylinder 0, Head 0, Sector 1 is mapped to the extended boot record . An error condition is generated for any attempt to do C,H,S I/O beyond the size of the extended volume in question.