[XT] [AT]
Expects: AH    08H
DL    drive: 0-3=diskette; 80H-81H=hard disk
                                                                  
Returns: AH    BIOS disk error code if CF is set to CY
CX    maximum value for cylinder and sector (see below)
DL    number of hard disks on first controller
DH    maximum value for head
ES:DI address of Hard Disk Parameter Table
                                                                  
Info: Returns information about a drive.  These values are initially
set from a table in ROM, determined by the disk-type code stored

CX Bits 6-7 of CL are the high two bits of the 10-bit value whose
low 8 bits are in CH.  See INT 13H 02H for details.

See Also: DOS Fn 440dH 60H (IOCTL get block device parameters)
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INT 13H 08H: Get Drive Parameters