HP Compaq d330 DT Hardware Reference Manual page 36

Hardware Upgrades
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5. Install four guide screws, two on each side of the drive.
Installing the Guide Screws
Extra guide screws are provided on the chassis basepan, under the
front bezel. Hard drives use 6-32 standard screws. All other drives use
M3 metric screws. The HP-supplied metric screws are black. The
HP-supplied standard screws are silver.
6. Lift up on the hard drive bracket 1, then rotate it down 2 to gain
access to the drive bay.
Opening the Hard Drive Bracket
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