Fujitsu PG-126 User Manual page 46

You can determine the cause of and solution for a problem from the indicated sense
key information. The values and meanings of the sense keys displayed most
frequently are given below.
− 02h - Not ready
− 03h - Medium error
− 04h - Hardware error
− 05h - Illegal request
− 06h - Unit attention
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Medium not ready for formatting. Check to see if the medium has been inserted
into the drive and that it has spun up to speed.
The disk medium failed. If a failure occurs with a removable-media drive, use
another disk medium. If a hard disk drive fails, it is assumed that the disk itself is
physically damaged. Use SCSISelect utility to check and format the medium.
The disk drive failed. Contact the disk drive manufacturer.
This card format utility does not support a low-level format of this device.
However, the manufacturer may have already performed a low-level format for
the device.
A removable medium may be write-protected. Disable write-protection and
reexecute the utility.