Hitachi Travelstar 5K320 HTS543232L9A300 Manual page 50

Device Ready. RDY=1 indicates that the device is capable of responding to a command.
DRDY (RDY)
RDY will be set to 0 during power on until the device is ready to accept a command.
DF Device Fault. DF=1 indicates that the device has detected a write fault condition. DF is set to
0 after the Status Register is read by the host.
DSC Device Seek Complete. DSC=1 indicates that a seek has completed and the device head is
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.
DRQ Data Request. DRQ=1 indicates that the device is ready to transfer a word or byte of data
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=1 indicates that an error occurred during execution of the previous command. The
ERR
Error Register should be read to determine the error type. The device sets ERR=0 when the
next command is received from the host.
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5K320 SATA OEM Specification