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

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

	0	0		0	0	0	0	0	0
Reserved
									Size (SCSI)
			Device Code					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.

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