Hard Drives

Overview

Hard drives are non volatile devices that store data on a rapidly rotating platter with a magnetic surface. The hard drive is physically sealed in a box with a rotating magnetic platter and a read-write lens. Stored data can be read, written, and altered. Even when the power is switched off, the data remains saved. The hard disk attaches itself to the host adapter, an integral part of the motherboard of the computer through a variety of connectors including a Universal Serial Bus (USB) interface, a Fiber Chanel (FC) interface, a Small Computer System Interface (SCSI,) and a Serial AT Attachment (SATA) interface.

It is not necessary to set up a hard disk inside the computer. It has been found that there is a considerable performance boost when the hard drive is external. Latest trends and technology have witnessed remarkable developments in the size, capacity, and speed of hard disks.

Benefits

A hard drive enables you to store data. Data can be easily retrieved and rewritten as required from the hard disk. The computer allows you to perform different task while reading and recording data from a hard disk. When compared to a flash drive or a disk drive, a hard disk has a higher capacity to read and write data.

Hard disks come in different sizes. You can choose the capacity depending on the amount of data that you want to save. Security is another important aspect of hard disks - the data that is written on the hard disk will not be deleted, unless it comes in contact with a large magnetic field, or it is destroyed physically. Hard disks are available in different physical sizes that match the dimensions of the computer that you are working with. Some hard disks are manufactured with bundled software and help files that let you troubleshoot errors and problems.

How It Works

Hard disks contain nonmagnetic platters coated with thin layers of magnetic material and an actuator arm that reads data. These disk drives write data by magnetizing the ferromagnetic material with a directional orientation to represent 0s and 1s. The disks are read by recognizing the magnetization of the specific sector. When a file is accessed, a request is made to the hard disk and the actuator moves to the position of the data in the magnetic portion. The data read by the actuator is then sent to the controller's card buffer and is processed by the motherboard, from where it is sent to the user. The whole data transfer process is completed within a few seconds.

Companies/Brands

Seagate, Toshiba, and Western Digital manufacture hard disk drives