The Operating Principles Of Hard Disk Drives

Published: 11th November 2010
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The best manner to understand how a hard disk drive works is to look inside it but opening a hard drive, most probably, will destroy it.

Hard disk drives have the following structure: an electronic logic control board; a certain number of turntables divided into a number of tracks and sectors; on both sides of the turntables read/write magnetic heads connected by a metal arm; an electro-mechanical system for blocking the heads on the leading zone when the disk is stopped; and a step-by-step electrical motor.

Beside computers, most of the video recorders, video cameras, digital video discs use hard disks as a storage background. All of them do the same thing: they store information in a permanently manner that will remain undamaged if the device is not electrically charged.

The most important criteria that reveal the performance of a hard disk drive are:

The transfer rate is the number of bits per second which a hard disk drive is able to transmit. The most common transfer rates are between 5 and 40 megabytes per second.

The necessary time for access refers to the necessary time for the hard disk device to locate the reading head on the turntable where the information is situated. An average access time is between 10 and 20 milliseconds.

The capacity is the number of bytes which the hard disk device is able to stock. Currently, computer hard disk drives have a storage capacity around 500 GB but the other video devices might need more.

Wherever the hard disk device is rated, there are some other important aspects that shouldn’t be ignored. The level of noise produced, the energy consumed, the number of input/output permitted operations and the physical size.

Technical devices containing hard disk drives must be gently handled because an inadequate physical maneuvering may harm any hard disk, producing areas where information can’t be read or written.

Often times, you will need a hard disk replacement for your PC, laptop or Apple Mac. Don't worry as today's technology allows it to be done for very affordable prices.

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