Hitachi C4K60 - Travelstar Slim - Hard Drive Specifications page 115

(3) Error data structure
The error data structure contains the error description of the command for which an error was reported
as described in following.
Byte
n Reserved
n+1 Content of the Error register after command completion occurred.
n+2 Content of the Sector Count Register after command completion occurred.
n+3 Content of the LBA Low (Sector Number) Register after command completion occurred.
n+4 Content of the LBA Mid (Cylinder Low) Register after command completion occurred.
n+5 Content of the LBA High (Cylinder High) Register after command completion occurred.
n+6 Content of the Device/Head register after command completion occurred.
n+7 Content written to the Status register after command completion occurred.
n+8 ~ n+25 Extended error information (Vendor Specific)
n+27 State
This contains a value indicating the state of the device when command was written to the
Command register or the reset occurred as described below.
01h: Sleep
03h: Active/Idle with BSY cleared to zero
n+28 ~ n+29 Life timestamp
This contains the power-on lifetime of the device in hours when command completion
occurred.
K6610170
Rev.2
Dec 22, 2004
Table 7.33 Error Data Structure
Description
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02h: Standby
04h: Executing SMART off-line or self-test