NEC Express5800/T120h User Manual page 146

Chapter 2 Preparations
Hold the tray firmly and insert it into the slot.
Close the handle slowly.
The tray is locked making a clicking sound.
Confirm the status of the drive from the combination of the LEDs of the drive.
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Note Push it all the way until the handle's lock touches the frame.

Hold the tray firmly with both hands.

Note When you push the drive into the slot, confirm the handle got hooked on the frame.
Express5800/T120h User's Guide
1. Installing Internal Optional Devices
2.5-inch drive
3.5-inch drive