Error Register; Features Register; Sector Count Register; Table 58.Error Register - Hitachi 7K80 - Deskstar - Hard Drive Specifications

9.10 Error Register

Table 59: Error Register
7 6
CRC UNC
This register contains the status from the last command executed by the device or a diagnostic code. At the comple-
tion of any command, except Execute Device Diagnostic, the contents of this register are always valid even if
ERR = 0 is in the Status Register.
Following a power on, a reset, or completion of an Execute Device Diagnostic command, this register contains a
diagnostic code. See Table 63: 'Diagnostic codes" on page 82 for the definitions.
Bit Definitions
ICRCE Interface CRC Error. When CRC = 1, it indicates that a CRC error has occurred on the data bus
(CRC) during a Ultra DMA transfer.
UNC Uncorrectable Data Error. When UNC = 1 it indicates that an uncorrectable data error has been
encountered.
IDNF ID Not Found. When IDN = 1, it indicates that the requested sector's ID field could not be found.
(IDN)
ABRT Aborted Command. When ABT = 1, it indicates that the requested command has been aborted
(ABT) due to a device status error or an invalid parameter in an output register.
TK0NF Track 0 Not Found. When T0N = 1, it indicates that track 0 was not found during a Recallibrate
(T0N) command.
AMNF Address Mark Not Found. When AMN = 1, it indicates that the data address mark has not been
(AMN) found after finding the correct ID field for the requested sector.

9.11 Features Register

This register is command specific. It is used with the Set Features command, the S.M.A.R.T. Function Set com-
mand, and the Format Unit command.

9.12 Sector Count Register

This register contains the number of sectors of data requested to be transferred on a read or write operation between
the host and the device. If the value in the register is set to 0, a count of 256 sectors (in 28-bit addressing) or 65,536
sectors (in 48-bit addressing) is specified.
If the register is zero at command completion, the command was successful. If it is not successfully completed, the
register contains the number of sectors which need to be transferred in order to complete the request.
The contents of the register are defined otherwise on some commands. These definitions are given in the command
descriptions.
5 4 3
0 IDNF 0
Deskstar 7K80 Hard Disk Drive Specification
2 1 0
ABRT TK0NF AMNF
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