Power Computing PowerCenter PRO User Manual page 127

Installing Internal Drives
Front access
If you are installing a drive which needs to be accessible from the front, such
as a removable-cartridge drive, you must remove the metal plate from the
front of the bay you are planning to use and the plastic insert from the front
panel.
If you don't need front access, skip to step 6 on page 100.
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PowerCenter Pro User's Guide
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