HP Compaq dx2100 ST Hardware Reference Manual page 29

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Hardware Reference Guide
8. Press the green drive retainer latch 1 located on the side of the
drive to disengage the drive from the drive cage. While pressing
the drive retainer latch, slide the drive forward and lift it up and
out of the drive cage 2.
Removing the Optical Drive
To replace the optical drive, reverse the removal procedure. When
replacing a drive, transfer the four guide screws from the old drive to
the new one. The screws take the place of drive rails.
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