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An external hard disk can add as much as an extra 3TB of storage space to your computer. Such vast storage allows you to keep all your music, movies and photos on your external hard drive so you won’t lose them if your computer gets damaged. If you're going to be transferring large files and don't want to have to wait forever then a USB 3.0 model may be the right thing for your tech set up.
For a more portable option, consider the likes of a USB flash drive or thumb drive which allows you to carry all your most important documents at all times. If you are struggling for USB ports on your computer, add a USB hub and increase its connectivity.