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structure; the second error, the second error log structure; etc. The sixth error shall create an error log data structure that replaces the first error log data structure; the seventh error replaces the second error log structure, etc. The error log pointer indicates the most recent error log structure. If fewer than five errors have occurred, the unused error log structure entries shall be zero filled. The following table describes the content of a valid error log data structure.
| Error log data structure |
Byte | Descriptions |
n | First command data structure |
n+12 | Second command data structure |
n+24 | Third command data structure |
n+36 – n+47 | Fourth command data structure |
n+48 – n+59 | Fifth command data structure |
n+60 – n+89 | Error data structure |
10.8.33.6.4 Command data structure
The fifth command data structure shall contain the command or reset for which the error is being reported. The fourth command data structure should contain the command or reset that preceded the command or reset for which the error is being reported, the third command data structure should contain the command or reset preceding the one in the fourth command data structure, etc. If fewer than four commands and resets preceded the command or reset for which the error is being reported, the unused command data structures shall be zero filled, for example, if only three commands and resets preceded the command or reset for which the error is being reported, the first command data structure shall be zero filled. In some devices, the hardware implementation may preclude the device from reporting the commands that preceded the command for which the error is being reported or that preceded a reset. In this case, the command data structures are zero filled.
If the command data structure represents a command or software reset, the content of the command data structure shall be as shown in the following Table.
| Command data structure |
Byte | Descriptions |
n | Content of the Device Control register when the Command register was written. |
n+1 | Content of the Features register when the Command register was written. |
n+2 | Content of the Sector Count register when the Command register was written. |
n+3 | Content of the Sector Number register when the Command register was written. |
n+4 | Content of the Cylinder Low register when the Command register was written. |
n+5 | Content of the Cylinder High register when the Command register was written. |
n+6 | Content of the Device/Head register when the Command register was written. |
n+7 | Content written to the Command register. |
n+8 | Timestamp |
n+9 | Timestamp |
n+10 | Timestamp |
n+11 | Timestamp |
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