HP ProBook 640 G1 Maintenance And Service Manual page 30

Component
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20 Chapter 2 External component identification
RJ-45 (network) jack/lights (2)
USB 3.0 charging port
Memory card reader
USB 3.0 ports (2)
Upgrade bay (optical drive shown)
Optical drive eject button (select models only)
ExpressCard slot or smart card reader
(depending on the configuration)
Description
Connects a network cable.
●
Amber (left): The network is showing activity.
●
Green (right): The network is connected.
Connects optional USB 3.0 devices and provides enhanced USB
power performance. The USB charging port can also charge
select models of cell phones and MP3 players, even when the
computer is off.
Reads data from and writes data to memory cards such as
Secure Digital (SD).
Connect optional USB 3.0 devices and provide enhanced USB
power performance.
The upgrade bay can hold either a hard drive or an optical drive
that reads and writes (select models only) to an optical disc. It
can also hold a weight saver option.
Releases the optical drive disc tray.
Supports optional ExpressCards or smart cards.