Hitachi T7K250 - Deskstar - Hard Drive Specifications page 185

URG (bit 7)
RC(bit 6)
NS (bit 5)
HSE (bit 4)
Stream ID (bit 0.2)
Feature Previous
CCTL(7:0)
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 spec-
Sector Number CurrentLBA (7:0)
Sector Number Previous LBA (31:24)
Cylinder Low Current LBA (15:8)
Cylinder Low PreviousLBA (39:32)
Cylinder High CurrentLBA (23:16)
Cylinder High Previous LBA (47:40)
Input parameters from the device
Sector Number (HOB=0) LBA (7:0) of the address of the first unrecoverable error.
URG specifies an urgent transfter 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 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 (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 (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 corresponding
error recovery sequence where it left off earlier.
Stream ID specifies the stream to be read. The device shall operate according to the
Stream ID set by the Read Stream command.
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)) useconds
If the value is zero, the device shall use the Default CCTL supplied with a previous Con-
figure 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.
ified in the Sector Count register, then 65,536 sectors will be transferred.
Deskstar T7K250 Hard Disk Drive Specification
171