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5 Hard disk drive
Your computer may have a large-capacity, customer-upgradable hard disk drive that can meet a variety of
storage demands. To keep the drive safe, Active Protection System™ is installed on your computer. For
details, refer to “Active Protection System” on page 22.
Note: The hidden service partition is the reason why there is less free space than expected on your HDD.
6 PCI Express Mini Card slot for wireless LAN/WiMAX
Your computer might include a PCI Express Mini Card for wireless LAN/WiMAX in the PCI Express Mini Card
slot which enables wireless LAN/WiMAX communications.
Rear view
Figure 6. ThinkPad Edge E420 and E520 rear view
1 Ethernet connector
2 Fan louvers (rear)
1 Ethernet connector
Connect your computer to a LAN with the Ethernet connector.
DANGER
To avoid the risk of electrical shock, do not connect the telephone cable to the Ethernet connector.
You can only connect an Ethernet cable to this connector.
Two indicators, to the lower right and left of the connector, show the status of the network connection. When
your computer connects to a LAN and a session with the network is available, the lower right indicator is
solid green. While data is being transmitted, the lower left indicator blinks yellow.
10 User Guide