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Copyright © 2000 Toshiba corporation. All rights reserved.
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10.8.33.6.5 Error data structure
The error data structure shall contain the error description of the command for which an error was reported
as described in the following table.
Error data structure
Byte Descriptions
n Content of the Device Control register after command completion occurred.
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 Sector Number register after command completion occurred.
n+4 Content of the Cylinder Low register after command completion occurred.
n+5 Content of the 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+26 Extended error information
n+27 State
n+28 Life timestamp (least significant byte)
n+29 Life timestamp (most significant byte)
Extended error information shall be vendor specific.
State shall contain a value indicating the state of the device when command was written to the Command
register or the reset occurred as described in the following Table.
State field values
Value State
x0h Unknown
x1h Sleep
x2h Standby
x3h Active/Idle with BSY cleared to zero
x4h Executing SMART off-line or self-test
x5h-xAh Reserved
xBh-xFh Vendor unique
The value of x is vendor specific and may be different for each state.
Sleep indicates the reset for which the error is being reported was received when the device was in the
Sleep mode.
Standby indicates the command or reset for which the error is being reported was received when the
device was in the Standby mode.
Active/Idle with BSY cleared to zero indicates the command or reset for which the error is being reported
was received when the device was in the Active or Idle mode and BSY was cleared to zero.
Executing SMART off-line or self-test indicates the command or reset for which the error is being reported
was received when the device was in the process of executing a SMART off-line or self-test.
Life timestamp shall contain the power-on lifetime of the device in hours when command completion
occurred.
10.8.33.6.6 Device error count
The device error count field shall contain the total number of errors attributable to the device that have
been reported by the device during the life of the device. These errors shall include UNC errors, IDNF
errors for which the address requested was valid, servo errors, write fault errors, etc. This count shall not
include errors attributed to the receipt of faulty commands such as commands codes not implemented by
the device or requests with invalid parameters or invalid addresses. If the maximum value for this field is
reached, the count shall remain at the maximum value when additional errors are encountered and logged.