Updated July 21, 2017 Depending on the style of external hard drive you have will depend on the steps you have use. Turn off the external hard drive. Unplug all plugs leading to the external hard drive. Unscrew all screws on outer casing or pull plastic moldings off the case. Open up the external hard drive case and locate all plugs inside leading from case to hard drive. Unscrew any screws in the bottom of the hard drive. Once the hard drive is unscrewed from the bottom plate, unplug the power plug and the ribbon cable. To put a new hard drive into the case, simply follow the instructions from last to first. Writer Bio
