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Does an external hard drive work like a flash drive? - how does external drive towel work

I'm considering buying an external hard drive, but I'm not sure what they are doing. Am I right in thinking that this work primarily as a flash drive where I know what you can on the drive and want to take it to my vacation, or anywhere with me and if he is not on my computer, I can a connection to the outside of the portable unit of my husband and continue to work on my own business?