Lenovo ThinkPad X23 ThinkPad X20, X21, X22, X23, X24 Hardware Maintenance Manu - Page 6

Hard disk drive replacement strategy, How to use error messages, ThinkPad X20, X21, X22, X23, X24

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Hard disk drive replacement strategy Always try to run a low-level format before replacing a hard disk drive. 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 Symptom-to-FRU Index for the computer you are servicing. 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 non-SCSI errors. The following example shows which digits display the shorter POST error messages and also defines the SCSI information in each digit of an eight-digit error message. Shorter POST Messages 00000000 Reserved Device Code Size (SCSI) Slot Number (SCSI) Logical Unit Number (SCSI) ID (SCSI) 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. 2 ThinkPad X20, X21, X22, X23, X24

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Hard disk drive replacement strategy
Always try to run a low-level format before replacing a hard
disk drive.
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 Symptom-to-FRU Index for the computer you are
servicing.
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 non-SCSI errors.
The following example shows which digits display the
shorter POST error messages and also defines the SCSI
information in each digit of an eight-digit error message.
Shorter POST Messages
Reserved
Device Code
0
0
0
0
0
0
0
0
ID (SCSI)
Logical Unit Number (SCSI)
Slot Number (SCSI)
Size (SCSI)
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.
2
ThinkPad X20, X21, X22, X23, X24