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10.9 Error Register
Figure 55. Error Register
This register contains the status from the last command executed by the device or a diagnostic code. At
the completion 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 con-
tains a diagnostic code. See Figure 59 on page 75 for the definitions.
Bit Definitions
ICRCE (CRC)
Interface CRC Error. When CRC = 1, it indicates that a CRC error has occurred on the
data bus during a Ultra DMA transfer.
UNC
Uncorrectable Data Error. When UNC = 1 it indicates that an uncorrectable data error
has been encountered.
IDNF (IDN)
ID Not Found. When IDN = 1, it indicates that the requested sector's ID field could not be
found.
ABRT (ABT)
Aborted Command. When ABT = 1, it indicates that the requested command has been
aborted due to a device status error or an invalid parameter in an output register.
TK0NF (T0N)
Track 0 Not Found. When T0N = 1, it indicates that track 0 was not found during a
Recalibrate command.
AMNF (AMN)
Address Mark Not Found. When AMN = 1, it indicates that the data address mark has
not been found after finding the correct ID field for the requested sector.
10.10 Features Register
This register is command specific. This register is used with the Set Features command, the S.M.A.R.T.
Function Set command, and the Format Unit command.
10.11 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 is
specified.
If the register is zero at command completion, the command was successful. If it is not successfully com-
pleted, 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 differently on some commands. These definitions are given in
section 13.0, "Command descriptions" on 107.
Error Register
7
6
5
CRC
UNC
0
IDNF
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
4
3
2
0
ABRT
TK0NF
71
1
0
AMNF
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