Lenovo ThinkPad L420 (English) User Guide - Page 25
Bottom view, Mini Dock Series 3, and ThinkPad Mini Dock Plus Series 3. - docking station
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Bottom view Figure 4. ThinkPad L420 and L520 bottom view 1 Battery 3 Hard disk drive or solid state drive 5 PCI Express Mini Card slot for wireless WAN card or mSATA solid state drive (some models)d 2 Docking connector (some models) 4 Memory-upgrade slotd 6 SIM card slot 1 Battery Use your computer with battery power whenever ac power adapter 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 19. 2 Docking connector (some models) Depending on models, your computer may equipped with a docking connector. The docking connector can extend the computer capabilities when you are in your office or home with a ThinkPad port replicator or a ThinkPad docking station. Note: If your computer has a docking connector, it supports ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, and ThinkPad Mini Dock Plus Series 3. 3 Hard disk drive or solid state drive Your computer may have a large-capacity, customer-upgradable hard disk drive that can meet a variety of storage demands. To keep the data on your drive safe, Active Protection System™ is installed on your computer. For details, refer to "Active Protection System" on page 18. With Lenovo technologies advancing to provide you with the best engineered systems, some models are equipped with a solid state drive for data storage. This cutting-edge technology enables notebook computers to be lighter and faster. Note: The hidden service partition is the reason why there is less free space than expected on your hard disk drive. Chapter 1. Product Overview 7