NEC EXP339 User Manual page 73

Chapter 2 Preparations
8. Unlock the handle in the tray for a hard disk drive.
9. Hold the tray firmly and insert it in the slot.
10. Gently close the handle until it clicks, indicating that
it is locked.
Update the system configuration information by following procedure.
1) Connect the AC cord to the server, then push the power switch to power on.
2) If POST screen is indicated, press F2 key of the keyboard and enter BIOS setup screen.
3) The POWER switch is pressed and the power supply of the server is turned off.
4) Remove the AC cord from the server, and leave the AC power of the server off around 30 seconds.
5) Connect the AC cord to the server again, and push POWER switch in order to power on the server.
Note 
Push it all the way until the handle's lock touches the frame.

Hold the drive carrier firmly with both hands.
Note
When you push the drive into the slot, confirm the handle got hooked on the frame.
Express5800/T110j User's Guide
1. Installing Internal Optional Devices
73