HP 6 - Manual (Page 45)

English 33
2 How to Install Accessories In Your PC
Installing Mass Storage Devices
5 Remove the tray by pushing it from the inside and sliding it out the
back of the computer.
6 If there is a disk drive on the tray (and you want to replace it),
remove the drive by unscrewing it from the back of the tray.
7 Secure the new drive onto the tray with the screws provided. Ensure
that the drive connectors face the correct way.
8 Slide the tray back into the rear of the computer, pushing it firmly
into position.
Securing 3.5-inch
hard disk drive to tray
Securing 5.25-inch
hard disk drive to tray