Lenovo ThinkPad 320 (English) User Guide - Page 23
Bottom view, Battery, Memory-upgrade slot, SIM card slot, PCI Express Mini Card slot for wireless WAN
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Bottom view Figure 4. Bottom view 1 Battery 3 SIM card slot 5 Hard disk drive 2 Memory-upgrade slot 4 PCI Express Mini Card slot for wireless WAN 6 PCI Express Mini Card slot for wireless LAN/WiMAX 1 Battery Use your computer with battery power whenever ac power is unavailable. By installing an extended life battery available as an option you can extend the operating time of the computer. You can also use Power Manager to adjust your power setting as needed. For details, refer to the instructions in "Power Manager" on page 17. 2 Memory-upgrade slot You can increase the amount of memory in your computer by installing a memory module in the memory slot. Memory modules are available as options. 3 SIM card slot If your computer has a wireless WAN feature, it might require a SIM (Subscriber Identification Module) card to establish a wireless WAN (Wide Area Network) connection. Depending on the country of delivery, the SIM card might be already installed in the SIM card slot. 4 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 for wireless WAN communications. 5 Hard disk drive Your computer might 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 16. Chapter 1. Product Overview 7