Different models have different memory locations. Some are in a compartment on the bottom of the ThinkPad's chassis. Some require you to remove the ThinkPad keyboard, and the memory is installed under there.
And some are a combination of both locations (like the ThinkPad T43 for instance) You need to know your IBM ThinkPad Model and Type ... then go to Lenovo's website and do a search for specific laptop. Lenovo gives you step by step instructions and even videos on how to install or remove memory from various ThinkPads.
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