Fujitsu MHW2040BS Product Manual page 174

Interface
At command issuance (Shadow Block Registers setting contents)
CM
DH
CH
CL
SN
SC
FR
At command completion (Shadow Block Registers contents to be read)
ST
DH
CH
CL
SN
SC
ER
*1 If the command was terminated because of an error, the number of
sectors for which data has not been written is set in this field.
5-100
1 1 0 0
x L x x
Start cylinder No. [MSB] / LBA
Start cylinder No. [LSB] / LBA
Start sector No.
Transfer sector count
xx
Status information
x L x x
Start cylinder No. [MSB] / LBA
Start cylinder No. [LSB] / LBA
Start sector No.
00 (*1)
Error information
1 0 1 R
HD No. / LBA
/ LBA [LSB]
HD No. / LBA
/ LBA [LSB]
C141-E249