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Nunya: Upgrading to 870 QVO is now easier than ever for anyone with a desktop PC or laptop that supports a standard 2.5-inch SATA form factor. Simply plug in the 870 QVO into a SATA slot and let the updated migration software take care of the rest. ^Samsung Memory
Sorry, there was a problem. Please try again later.Yes it will, but I believe the Thinkpad T420 comes with a 2.5" hdd. The samsung ssd is thinner and may need a small strip of foam tape to prevent it from disconnecting itself. This upgrade from an hdd to a ssd will make a giant difference in the loading times of programs and your OS. You will also need a hard drive bridge with a usb connection to clone the hard drive to the new drive. Just make sure to choose a cloning software that allows a hhd to be cloned to an ssd.
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