Lenovo USB 2.0 CD-RW/DVD-ROM Combo II Drive - Manual (Page 25)

6 Emergency eject
mechanism
Insert a stiff, thin object such as a straightened paper-clip into
the emergency eject hole to open the tray.
Attention: Be sure the power is off when using the
emergency eject lever. Use the eject button instead of the
emergency eject lever except in an emergency.
Chapter 4. Preparing to use the Combo II Drive 4-3