Firewire or USB on an external drive

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Well there are quite a fiew options out there. Many will use up two usb ports one for data and one for power. Be aware that if you are powering the HD from the computer it will drain your laptop battery faster.

Here are a fiew options

https://www.priorityelectronics.com/universal/ecs-usb20-25b.htm
https://www.priorityelectronics.com/universal/sbt-eku25.htm
https://www.xpcgear.com/ue25u1.html