Hard Drives: How They Work


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Disk Density

-Why is it that engineers have been able to put 1 gigabyte onto one platter when a 1 gigabyte hard drive was at one time the size of a small car? We need to understand a little about density.

-Disk Density is measured and is also called areal density. The idea is to be able to put more information in a smaller space. When you can achieve this you will also allow more information to pass underneath the read/write heads thus improving data transfer rates. This is pretty nice and will get better. Now how is this density calculated? For the most part the density I measure in Bit per Inch (BPI) and track per inch (TPI). When we multiply the TPI and BPI we get areal density. Now when more exotic materials and better technologies come together we need to beef up the older stuff. What I mean by this is the read/write heads, rotation speed, Disk platter makeup. All of these need a improvement when making better use of space. We need to get an idea of these components and what they do to make the hard drive faster and better.

What Makes It Happen


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