DosPhysicalDisk

#define INCL_DOSDEVICES

USHORT  rc = DosPhysicalDisk(Function, DataPtr, DataLen, ParmPtr, ParmLen);

USHORT           Function;      /* Type of information */
PBYTE            DataPtr;       /* Pointer to return buffer */
USHORT           DataLen;       /* Return buffer length */
PBYTE            ParmPtr;       /* Pointer to user-supplied information */
USHORT           ParmLen;       /* Length of user-supplied information */

USHORT           rc;            /* return code */