Hitachi HTS542516K9SA00 Specifications page 47

settled over a track. DSC is set to 0 by the device just before a seek begins. When an error
occurs, this bit is not changed until the Status Register is read by the host, at which time the
bit again indicates the current seek complete status.
When the device enters into or is in Standby mode or Sleep mode, this bit is set by device in
spite of not spinning up.
Data Request. DRQ=1 indicates that the device is ready to transfer a word or byte of data
DRQ
between the host and the device. The host should not write the Command register when
DRQ=1.
CORR (COR) Corrected Data. Always 0.
IDX Index. Always 0
ERR ERR=1 indicates that an error occurred during execution of the previous command. The
Error Register should be read to determine the error type. The device sets ERR=0 when the
next command is received from the host.
Page 47 of 171
5K250 (SATA) OEM Specification