Computer Memory Defined

How does a computer's hard disk Works

A computer hard disk or fixed disk or hard drive is where all your data is stored when a computer is off. Since the data is stored magnetically, you do not need power to retain or remember all these data.

Construction physics.

The hard drive is usually a metal disk coated on both sides with a special magnetic material, usually a compound iron oxide, which has small magnetic particles that can be oriented to represent the bits – which are the basic unit of computer memory and are equivalent to a switch, whether inside or outside.

This disc is turned to a very high speed of 8000 revolutions per minute or more, and then the two reading / Write heads that are used to effectively recover data from this disk, skim only a few hundredths of a millimeter of the surface of the spinning disc. Reading and write heads are suspended at the end of the metal arms that are capable of moving from the outer edge to inner edge of this disk, so they can search data required. Very powerful rare earth magnets to help control the rapid movement of these heads.

How data is stored on the hard disk.

Data from a hard disk is organized in concentric tracks, almost microscopic tracking wide, and each is divided into sectors, like slices of pizza, and hard drives having more than one disk or plate, cylinders are also defined. A cylinder is that all tracks on multiple sources, which are the same circumference.

When a disc is still raw, you need to be formatted, which is the process whereby the magnetic disk is divided on these issues, sectors and cylinders for which data can be written in the right place. A boot record is also written to the disk during formatting, a track that contains information about how the disk is formatted and constructed.

In a rotation speed of 8000 RPM, the outer edge of the blade is moving under the heads at a speed of more 100km / h, or more than 60 miles per hour. If the heads are touching the surface at this speed, some serious damage occurring. This sometimes happens when a hard drive goes a strong jolt, and this is known as the head fall. Data is transferred through the head is giving an instruction to read or write to the disk surface the magnetic moment in the head flies over that part of the disc. Thus the head has about a 10,000 th of a second to get your paperwork a block or data segment.

In the old days of computers, the computer itself had to control the data was placed in a hard disk. In modern computers, hard drives come with built in IDE, or Integrated Drive Electronics, which handles all the nitty gritty of random data storage, leaving the CPU of the computer to follow forward with other important work. This system streamlines the overall team performance by sharing the workload.

Hard drives can store large amounts of data. The size of the most common unit in the computers at the moment is in the region of 120 gigabytes, there is sufficient space to store the text closely than 150,000 best-selling novels. Laptops are now dating 1 terabyte hard drives, which is 1,000 gigabytes of storage. Most desktop computers can accommodate 4 hard drives, so it loads the text of all books at your local library for the city in its hard drives of personal computers is very possible.

Although a hard drive does not seem like much, is a remarkable piece of precision engineering, married with lightning speed electronics that has steadily improved since the first 5 megabyte hard drives came out in the 1980

Hard drives have come a long way.

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Let’s Play: The Neverhood [PC][HD] – Part 9: Memory Pays Off

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