IBM IntelliStation M Pro 6225 Hardware Maintenance Manual And Troubleshooting Manual page 56

9. Remove the retainer clip from the side of the drive; note its orientation for use
during installation.
Retainer clip
To replace the CD-ROM or CD-RW drive, see "Installing a drive in bay 2, 3, or 4"
on page 48.
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IntelliStation M Pro Types 6225 and 6228: Hardware Maintenance Manual and Troubleshooting Guide