How can hard drives keep storing more and remain the same size?

I've always wondered how it is that a hard drive of the same physical size can store varying capacities of data. For example, how is it that your average 2.5%26quot; drive was once able to hold only a few dozen GB, but now can store several TB? What part of the technology changes and allows manufacturers to cram more onto something the same size.as before?



Thanks in advance for any answers.
How can hard drives keep storing more and remain the same size?
Basically the precision to which they can detect the tiny magnetic fields is increasing. Think of the disk as being divided up into tinier and tinier spaces.



By the way-- a disk with one terabyte hasapproximately 8,796,093,020,000 little ones and zeros.
How can hard drives keep storing more and remain the same size?
Compress the files into a Zipped folder, you can store a multitude of files that way

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