DescriptionThree generations of hard drives bottom.agr.jpg
English: Bottom view of three generations of hard drives, all 3-1/2" form factor with identical mounting holes. From left to right, 1992, 80 megabytes, SCSI; 2002, 30 gigabytes, IDE; c2017, 2 terabytes, eSATA. The difference in capacity is a factor of 25,000.
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