HP Compaq Elite 8300 Series Reference Manual page 89

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Secure the drive to the bay adapter bracket by installing four black M3 adapter bracket
screws through the sides of the bracket into the drive.
Figure 3-28 Securing the Drive in the Adapter Bracket
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Install four 6-32 silver and blue isolation mounting guide screws in the adapter bracket
(two on each side of the bracket).
Figure 3-29 Installing Isolation Mounting Guide Screws in the Adapter Bracket
Installing and Removing Drives 81