Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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Feature Current
URG (bit7) URG specifies an urgent transfer request. The Urgent bit specifies that the com-
mand 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 cor-
responding error recovery sequence where it left off earlier.
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.
Feature Previous
CCTL (7:0)
The time allowed for the current command's completion is calculated as follows:
Command Completion Time Limit = (content of the Feature register
Previous) * (Identify Device words (99:98)) seconds
If the value is zero, the device shall use the Default CCTL supplied with a previ-
ous Configure Stream command for this Stream ID. If the Default CCTL is
zero, or no previous Configure Stream command was defined for this Stream ID,
the drive will ignore the CCTL. The time is measured from the write of the
command register to the final INTRQ for command completion.
Sector Count Current The number of continuous sectors to be transferred low order, bits (7:0)
Sector Count Previous The number of continuous sectors to be transferred high order, bits (15:8). If
zero is specified in the Sector Count register, then 65,536 sectors will be trans-
ferred.
Sector Number Current LBA (7:0).
Sector Number Previous LBA (31:24).
Cylinder Low Current LBA (15:8).
Cylinder Low Previous LBA (39:32).
Cylinder High Current LBA (23:16).
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