Lenovo ThinkPad T420 4236 User Manual page 27

1
SIM card slot
3
Docking connector
5
Hard disk drive or solid state drive
1 SIM card slot
If your computer has a wireless WAN feature, it may require a SIM (Subscriber Identification Module) card to
establish a wireless WAN (Wide Area Network) connections. Depending on the country of delivery, the SIM
card may be already installed in the SIM card slot.
2 Battery
Use your computer with battery power whenever ac power is unavailable.
By installing a second battery, available as an option, in the serial Ultrabay slim, 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 23.
3 Docking connector
With a ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series
3, and ThinkPad Mini Dock Plus Series 3 (170 W), you can extend the computer capabilities when you
are in your office or at home.
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 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 drive safe, Active Protection System™ is installed on your computer. For
details, refer to "Active Protection System" on page 21.
If you wish, you can purchase another hard disk drive and install it in the serial Ultrabay slim.
®
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, smaller and faster.
Note: The hidden service partition is the reason why there is less free space than expected on your hard
disk drive or solid state drive drive. This reduction is more noticeable on the solid state drive drive because
of its smaller capacity.
6 PCI Express Mini Card slot for wireless WAN card or mSATA solid state drive
Your computer might include a PCI Express Mini Card in the PCI Express Mini Card slot which enables
wireless WAN communications.
With Lenovo technologies advancing to provide you with the best engineered systems, some models are
equipped with a mSATA solid state drive for data storage.
2
Battery
4
Memory-upgrade slot
6
PCI Express Mini Card slot for wireless WAN card or
mSATA solid state drive
.
Chapter 1 Product Overview
9