Format of NetWare "Add User Disk Space Restriction" request buffer:
Offset	Size	Description	)
 00h	WORD	000Ah (length of following data)
 02h	BYTE	21h (subfunction "Add User Disk Space Restriction")
 03h	BYTE	volume number
 04h	DWORD	(big-endian) object ID
 08h	DWORD	(big-endian) disk space limit in 4K blocks
		00000000h to 40000000h