Hard Drive Caddy Cover Rails For IBM Lenovo Thinkpad T420 T420i 04W1637 W Screw

here are a few key upgrades you can make to your Lenovo T 40 to help boost performance if you bought your laptop with the least amount of RAM chances are I should still have an open dim slot after removing the battery unscrew the back panel with a small Phillips head screwdriver pull the cover off and set it to the side some people will suggest you match the exact manufacturer of the RAM this isn't a bad idea but I didn't have a problem buying the cheapest four gigabyte stick as long as it's ddr3 1333 speed you should be fine put the RAM in at an angle and just push down until it snaps in it should be secure and not move around put the cover plate back on and that's it you're done next I replace the primary hard drive with a solid state disk unscrew the side plate and remove the panel to access the hard drive it comes off easiest if you pull it by the top corner where the screw is well