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Areal Density

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What is Areal Density?

Areal density is the number of bits per square inch of storage surface. Areal density is commonly used as a defining measure of potential storage density in hard drives. In theory the greater the density the greater the amount of storage that can be achieved on any given hard disk surface area. The calculation is bpi X tpi = areal density or where the number of bits per inch multiplied by the number of tracks per inch gives the areal density.

In the early days of drive technology density was measured in thousands of bit per sq. inch but today’s drives can exceed 2 billion which is essentially why drive storage capacities have shot up to beyond what most people would ever need in a life time. However the next generation of technology is already upon us and data can now be written to the hard drive in a different way (perpendicular as opposed to longitudinal) which is expected to give a massive further jump in achievable areal density and subsequently even larger capacity drives (if you need them) and add additional challenges if you need hard drive recovery .
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