I take it that the external drive is powered from your USB port. It sounds as though there is not enough power available to run that and your mouse. Does the freezing happen when you are running on mains power as well as on battery?
To upgrade a laptop's hard drive, you'll also need a traditional desktop system on hand. Most laptops allow for the installation of only one hard drive. But by using an inexpensive laptop hard-drive adapter, such as the one pictured below, you can cable both the original and new laptop hard drives to a desktop PC. '
Thanks canarieslover though.
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