How hard is it to install an extenal HD? How tech savvy does one have to be? Is it just a matter of plugging it in somewhere and you're good to go? Are external HDs much more costly than internals? If the price is comparable, why not just install an external HD instead of an internal one, so that upgrading if you like (or unplugging it to take with you for security perhaps) is easy? Thanks for answers as this interests me.
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