Hard disk drive replacement strategy
Always try to run a
Attention
The drive startup sequence in the computer you are servicing might have been changed. Be extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect drive, data or programs can be overwritten.
How to use error messages
Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed, begin the diagnosis with the first error code. Whatever causes the first error code may also cause false error codes. If no error code is displayed, see if the error symptom is listed in the
How to read POST error messages
POST error messages are displayed on the screen as three, four, five, or eight digits. The error messages that can be displayed as shorter POST messages are highlighted in this index. Some digits have one meaning for SCSI errors and a different meaning for
The following example shows which digits display the shorter POST error messages and also defines the SCSI information in each digit of an
Shorter POST Messages
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| Device Code |
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| ID (SCSI) |
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Each SCSI device is assigned a unique SCSI ID. Duplicate SCSI ID settings can generate a false error message. Use the SCSI ID to determine whether an error message is coming from an internal or an external device.
2ThinkPad X20, X21, X22, X23, X24
