INT 21 - Novell NetWare - FILE SERVER - GET DRIVE MAPPING TABLE
        AH = E3h subfn D7h
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            C6h no console rights
Notes:  this function is supported by Advanced NetWare 2.1+
        the calling workstation must have console operator privileges
SeeAlso: AH=E3h/SF=C8h,AH=E3h/SF=D6h,AH=E3h/SF=D9h,AH=E3h/SF=E6h,AH=E3h/SF=E9h

Format of request buffer:
Offset  Size    Description
 00h    WORD    0001h (length of following data)
 02h    BYTE    D7h (subfunction "Get Drive Mapping Table")

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 00ECh (length of following results buffer)
 02h    DWORD   (big-endian) clock tick elapsed since system started
 06h    BYTE    fault tolerance (SFT) level
 07h    BYTE    number of logical drives attached to server
 08h    BYTE    number of physical drives attached to server
 09h  5 BYTEs   disk channel types (00h none, 01h XT, 02h AT, 03h SCSI,
                04h disk coprocessor drive, 32h-FFh value-added drive types)
 0Eh    WORD    (big-endian) number of outstanding controller commands
 10h 32 BYTEs   drive mapping table (FFh = no such drive)
 30h 32 BYTEs   drive mirror table (secondary physical drive, FFh = none)
 50h 32 BYTEs   dead mirror table (last drive mapped to, FFh if never mirrored)
 70h    BYTE    physical drive being remirrored (FFh = none)
 71h    BYTE    reserved
 72h    DWORD   (big-endian) remirrored block
 76h 60 BYTEs   SFT error table (internal error counters)

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