Format of COMBI-disk data packet:
Offset	Size	Description	)
 00h  6 BYTEs	ASCIZ signature "COMBI"
 06h	WORD	version (high byte = major, low = decimal minor version)
 08h	BYTE	current options
 09h	BYTE	sectors per allocation block
 0Ah	WORD	maximum buffer in KB
 0Ch	WORD	current buffer in KB (less than max if XMS memory being lent)
 0Eh	WORD	total number of allocation blocks
 10h	WORD	current number of allocation blocks
 12h	WORD	number of blocks being used by RAM disk
 14h	WORD	number of blocks being used by cache or unused
 16h	WORD	number of dirty cache blocks
 18h	WORD	number of blocks which could not be written out due to errors
 1Ah	WORD	total number of read requests
 1Ch	WORD	total number of sectors read
 1Eh	WORD	number of BIOS read requests (cache misses)
 20h	WORD	number of sectors read via BIOS (cache misses)
 22h	WORD	total number of write requests
 24h	WORD	total number of sectors written
 26h	WORD	number of BIOS write requests
 28h	WORD	number of sectors written via BIOS
 2Ah	WORD	number of RAM disk read requests
 2Ch	WORD	number of sectors read from RAM disk
 2Eh	WORD	number of RAM disk write requests
 30h	WORD	number of sectors written to RAM disk