What would you be using the external drive to do?
If it is just for occasional archiving then size/weight/speed probably doesn't matter.
If you are needing to haul it around with you then size is an issue. If you are running a database off of it (or any application that is accessing a lot of data randomly) then speed is an issue.
If you are using it for long periods at a time then a fan is more important. A few short periods at a time and it won't generate enough heat to worry.
So a lot depends upon how you plan on using an external drive.
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