Bitfields for general drive configuration:
Bit(s)	Description	)
 15	0   reserved for non-magnetic drives
 14	format speed tolerance gap required
 13	track offset option available
 12	data strobe offset option available
 11	rotational speed tolerance is > 0.5%
 10	disk transfer rate > 10 Mbs
 9	disk transfer rate > 5Mbs but <= 10Mbs
 8	disk transfer rate <= 5Mbs
 7	removable cartridge drive
 6	fixed drive
 5	spindle motor control option implemented
 4	head switch time > 15 usec
 3	not MFM encoded
 2	soft sectored
 1	hard sectored
 0	reserved (0)