HP Compaq Elite 8300 Series Reference Manual page 122

2. Disconnect the drive cables from the rear of the drive, or, if you are removing a media card
reader, disconnect the USB cable from the system board as indicated in the following illustration.
Figure 4-27
3. Press down on the green drive retainer button located on the left side of the drive to disengage
the drive from the drive cage (1). While pressing the drive retainer button, slide the drive back
until it stops, then lift it up and out of the drive cage (2).
Figure 4-28
114 Chapter 4 Small Form Factor (SFF) Hardware Upgrades
Disconnecting the Media Card Reader USB Cable
Removing a 3.5-inch Drive (Media Card Reader Shown)