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I think a way more of 20TB

Yeah. If you have 1TB HDDs, that looks about 6 or 7 HDDs high, and the area of the top, if rectangularized, looks like about 8 HDDs. So that's ~50TB by a very rough estimate.

And I think you can actually buy either 1.5 or 2TB now, so that would make it ~100TB.

100 terabytes = 104 857 600 megabytes, which is a factor of 524 288

I don't understand, can you explain? (Sorry!)

He's just saying that 100 TB = 100 * 2^20 MB = 104 857 600 MB. Since the original storage device (the link posted) was 200MB in the same volume, that means we've improved by a factor of (104 857 600 MB)/(200 MB) = 524 288. So hard drives are now ~524288x denser storage devices than that spool.

Not to mention that it would be probably considerably cheaper than this device used to cost back then. (I have no data to back up my claims, it's just a wild guess.)

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