If the size of the (accessible) RAM is limited, why isn't the hard disk?

Posted by sub on Super User See other posts from Super User or by sub
Published on 2010-03-25T16:59:16Z Indexed on 2010/03/26 15:43 UTC
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When the number of possible RAM adresses is limited by the computer architecture (32/64 bit), why isn't the size of the hard disk limited?

Or is it limited? If yes, what would be the highest possible size of a hard-disk for a 32-bit computer?

How are the adresses of hard-disks handled then?

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