Deskstar T7K500 Hard Disk Drive Specification
190
Output Parameters To The Device
Feature Current
URG (bit7)
URG specifies an urgent transfer request. The Urgent
bit specifies that the command should be completed in
the minimum possible time by the device and shall be
completed within the specified Command Completion Time
Limit.
RC (bit6)
RC specifies Read Continuous mode enabled. If the Read
Continuous bit is set to one, the device shall not stop
execution of the command due to errors.
If the RC bit is set to one and errors occur in reading
or transfer of the data, the device shall continue to
transfer the amount of data requested and then provide
ending status with BSY bit cleared to zero, the SE bit
set to one, the ERR bit cleared to zero, and the type of
error, ICRC, UNC, IDNF or ABRT reported in the error
log.
If the RC bit is set to one and the CCTL expires, the
device shall stop execution of the command and provide
ending status with the BSY bit cleared to zero, the SE
bit set to one, the ERR bit cleared to zero, and report
the fact that the CCTL expired by setting the CCTO bit
in the error log to one.
In all cases, the device shall attempt to transfer the
amount of data requested within the CCTL even if some
data transferred is in error.
NS (bit5)
NS (Not Sequential) may be set to one if the next read
stream command with the same Stream ID may not be
sequential in LBA space.
HSE (bit4)
HSE (Handle Stream Error) specifies that this command
starts at the LBA of the last reported error for this
stream, so the device may attempt to continue its corre-
sponding error recovery sequence where it left off ear-
lier.
Stream ID (bit 0..2)
Stream ID specifies the stream to be read. The device
shall operate according to the Stream ID set by the Read
Stream command.
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