Acer Altos 1100 Series - Manual (Page 107)

Chapter 3 System Housing 3-13
3.6 Hard Disk Drive Cage
Your system comes equipped with a 3 drive, hot-pluggable cage that support
SCA connectors on the hard disk drives. There is also an Ultra 2 backplane
attached to the end of the cage.
1. Use your finger to release the drive tray as shown below and then pull it out.
2. Place a hard disk on the tray and secure it with four screws.
3. Insert the tray into the housing and then close the lid as shown below.