Fujitsu MHW2120BK Maintenance Manual page 115

At command completion (Shadow Block Registers contents to be read)
ST
DH
CH
CL
SN
SC
ER
*1 If the command is terminated due to an error, the remaining
number of sectors of which data was not transferred is set in this
register.
C141-E261
Status information
x L x x
Start cylinder No. [MSB] / LBA
Start cylinder No. [LSB] / LBA
Start sector No.
00 (*1)
Error information
5.3 Host Commands
HD No. / LBA
/ LBA [LSB]
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