INT 21 - Novell NetWare - FILE SERVER - GET DISK UTILIZATION
        AH = E3h subfn 0Eh
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            98h nonexistent volume
            F2h not permitted to read object
Notes:  this function is supported by Advanced NetWare 2.1+
        the caller must have bindery object read privileges
SeeAlso: 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    0005h (length of following data)
 02h    BYTE    0Eh (subfunction "Get Disk Utilization")
 03h    BYTE    volume number (00h-1Fh)
 04h    DWORD   object ID (big-endian)

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 000Bh (size of following results buffer)
 02h    BYTE    volume number (00h-1Fh)
 03h    DWORD   object ID (big-endian)
 07h    WORD    directories used by object (big-endian)
 09h    WORD    files created by object (big-endian)
 0Bh    WORD    disk blocks used by object-created files (big-endian)