Data check circuit of {TAIL ~ magnetic disk device} and {HEAD ~ data checking method} of magnetic disk device 
Data check circuit of { TAIL ~ magnetic disk device } and { HEAD ~ data checking method } of magnetic disk device
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH