HDD Storage Limit

Why do HDDs have a storage limit? Why can't they much higher than 4TB? Also, how does an HDD write things with the recorder(pointer - on HDD and taps HDD disk and writes). If this makes any sense lol, please respond ASAP. :D
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    what a strange question.

    data is stored on platters inside the hard drive. kind of like a double sided dvd. you can only fit so much data on a platter. even if you manage to make each bit one molecule in size, a platter could still only hold so much. hard drives have anywhere from 1-5 platters inside, they cant fit more without making the hard drive thicker. they dont make hard drives thicker because they have to be a certain size to fit properly in a case.
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