Hard disk rotation: How data is stored on the hard disk

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If you were asked to circle in a circle, how many times per minute would you be able to circle? If you are the fastest man in the world, no matter how many times you turn that round, you are bound to rate the machine.

No, you can't save any data on the go, but a hard disk is going to provide you with more than four thousand revolutions per minute. What happens to a hard disk drive that you use as permanent memory on your favorite computer that can easily hold several times more data than a library in your area? And what is the relationship between rotation or data collection? Let's see how information is stored through magnetism with the touch of science and technology this time!

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Before the start

Many of us know that there are two types of computer memory. Temporary or volatile and permanent or non-volatile. And the hard disk is included in the permanent memory. This means that the hard disk stores all the information you need for a long time. But how can so much information be stored in a device that fits so well in the palm of the hand?

The history of storing data on computers is very old. However, data storage through hard disks first began in the fifties of the twentieth century. Before the advent of hard disks, punch cards played a major role in storing data from the very beginning. Then one by one comes magnetic core memory, magnetic tape, magnetic drum memory. Then began the era of hard disk.

Before the advent of hard disks, giant devices could store a few kilobytes of data. And working with that data was also quite difficult and time consuming. Giant device but data holding capacity is very little compared to the current. Yes, a lot of wonderful things!

But even more surprising is that the first discovered hard disk could only store 5 megabytes of data. This means that nowadays it is equivalent to a selfie or an image file taken on your smartphone. IBM started this hard disk era in 1958. This storage device was first used on a computer called RAMAC 305. So let's dive deeper into the mystery of the hard disk's work.

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What is on a hard disk? The word hard disk is associated with something like a disk. When you open the aluminum cover of a modern hard disk, you can see that there are several disks arranged in successive layers (the number of disks determines the capacity), also called 'platter'. Each disc tends to be very thin. And the features match the name, because the discs are quite stiff. And each disc is connected to a powerful motor that can rotate at much higher speeds at the same time. Much depends on this rotation. One of the important ones is the data transfer rate, which means that the higher the rotation, the faster the data transfer. The unit of measurement of this rotation is rpm (revolutions per minute) or rotation per minute. This rotation is typically between 4,200-15,000 rpm on current hard disks.

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