HP ProBook 4740s Notebook-PC - Manual (Page 24)

Component Description
(1) USB 2.0 ports (2) Connect optional USB devices.
(2) Optical drive (select models only) Reads an optical disc.
NOTE: On select models, the optical drive also
writes to an optical disc.
(3) Optical drive light (select models only) Lights when the optical drive is active.
(4) Optical drive eject button (select models
only) Releases the optical drive disc tray.
14 Chapter 2 Getting to know your computer