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8.6 Device/Head Register
Table 24 Device/Head Register
Device/Head Register
7
6
5
4
3
2
1
0
1
1
1
DRV
HS3
HS2
HS1
HS0
This register contains the device and head numbers.
Bit Definitions
DRV
Device. This product ignores this bit.
HS3,HS2,HS1,HS0
Head Select. These four bits indicate binary encoded address of the head. HS0 is the least
significant bit. At command completion, these bits are updated to reflect the currently selected
head.
The head number may be from zero to the number of heads minus one.
In LBA mode, HS3 through HS0 contain bits 24-27 of the LBA. At command completion, these
bits are updated to reflect the current LBA bits 24-27.
8.7 Error Register
Table 25 Error Register
Error Register
7
6
5
4
3
2
1
0
ICRCE
UNC
0
IDNF
0
ABRT
TK0NF
AMNF
This register contains 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 valid even if
ERR=0 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 Section 10.2 for the definition.
Bit Definitions
ICRCE (CRC)
Interface CRC Error. ICRCE=1 indicates a CRC error occurred during FIS transmission or FIS
reception.
UNC
Uncorrectable Data Error. UNC=1 indicates an uncorrectable data error has been encountered.
IDNF (IDN)
ID Not Found. IDN=1 indicates the requested sector’s ID field could not be found.
ABRT (ABT)
Aborted Command. ABT=1 indicates 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. T0N=1 indicates track 0 was not found during a Recalibrate command.
AMNF (AMN)
Address Mark Not Found. This product does not report this error. This bit is always zero.
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Hard Disk Drive Specification