Bitfields for HyperDisk caching flags:
Bit(s)	Description	)
 0	staged writes enabled for floppy disks
 1	staged writes enabled for hard disks
 2	writes verified on floppy disks
 3	writes verified on hard disks
 4	reserved (0)
 5	reserved (0)
 6	floppy caching enabled
 7	all caching functions enabled