1) Upgrading a laptop hard drive to a Plextor SSD involves a three stage process: connecting the SSD via USB to clone the data from the hard drive, transferring data using cloning software, and physically installing the SSD inside the laptop. 2) The cloning software allows you to transfer all data and system settings from the hard drive to the SSD without needing to reinstall applications or settings. 3) Replacing the hard drive involves changing the BIOS SATA setting, removing the laptop cover and hard drive, installing the SSD, and replacing the cover.