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Tiny Read/Write Heads: The read/write heads in hard drives are incredibly small and float on a cushion of air just a few nanometers above the spinning platters. This is about the same height as the wavelength of visible light. If a speck of dust were to get between the head and the platter, it could cause data corruption.

https://droidcops.com/different-types-of-ssd-storage/

5 Different Types Of SSD Storage You Must Know - DroidCops SSDs on the market today can be distinguished based on their shape and size. These types of SSDs can be used for computers, whether a laptop or desktop.

The first disk drive, called RAMAC (random access method of accounting and control), was developed for the IBM 350 computer in 1957. Over the past decade,as the demands for digital data have exploded, the storage capacity of HDDs has grown at a matching
rate, if not faster. Today, a 3.5” HDD has a capacity of 160 GB, capable of storing nearly a thousand times more data than a HDD of the same size just ten years ago. The area storage density of a disk
surface in a RAMAC was only 2 kbit/in2. It is now 60 Gbit/in2, a 30 million-fold increase over the past
46 years with an average annual growth rate of
nearly 80% during the last ten years. Recent
demonstrations have shown area recording densities2
as high as 150 Gbit/in2.