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3 PCI Express Mini Card slot for wireless WAN
Your computer might include a PCI Express Mini Card for wireless WAN in the PCI Express Mini Card
slot which enables wireless WAN communications.
4 Memory-upgrade slot
You can increase the amount of memory in your computer by installing a memory module in the memory
bay. Memory modules are available as options.
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 21
.
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.
10 User Guide