Hard Disk, Most Important Thing To Save Your Data

Information on Duckpedia, Indonesia -- Harddisk (HD) or Harddisk Drive (HDD) is an electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material. The platters are paired with magnetic heads, usually arranged on a moving actuator arm, which read and write data to the platter surfaces. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. HDDs are a type of non-volatile storage, retaining stored data even when powered off.

Introduced by IBM in 1956, HDDs became the dominant secondary storage device for general-purpose computers by the early 1960s. Continuously improved, HDDs have maintained this position into the modern era of servers and personal computers. More than 200 companies have produced HDDs historically, though after extensive industry consolidation most units are manufactured by Seagate, Toshiba, and Western Digital. HDDs dominate the volume of storage produced (exabytes per year) for servers. Though production is growing slowly, sales revenues and unit shipments are declining because solid-state drives (SSDs) have higher data-transfer rates, higher areal storage density, better reliability, and much lower latency and access times.

Violations use both magnetic recording techniques and utilize the recording medium where the data stored therein can be changed or deleted at any time. Hard disks have containing magnetic media, as opposed to film sheets on floppy and tape.

Hardisk Components

In general, the main components that make up a hard disk consist of :

Platter: Disc, usually made of aluminum coated with magnetic material. Basically this is the platter of data on the hard disk is stored. A disc can have multiple simultaneously working plates.

Reader arm: This component supports the head that serves to read / write on the surface of the platter. This sleeve is a mechanism that is driven by a motor-linear. This mechanism moves with very high speed and precision. The long arm on the current hard disk is able to move from center to plate, and then back to the center 50 times a second.

Data stored on the hard disk in the form of a file. A file is a name for a set of bytes. Files can be either ASCII characters or codes that are documents, or it could be for application software to be run by the computer. In summary, No matter, whatever the contents, the files are the byte exchange patterns. When a program runs a computer command, the hard disk reads the byte and sends it to the CPU.

The plate surface saves data in sectors and tracks. If illustrated, keep track of the cosentric circles along the surface of the platter. Each track will be further divided into several sectors.

In Figure 2 above, we can see how the platter is divided into sectors and tracks. The yellow part is the track, while the blue color represents the sector. A sector will contain a fixed number of bytes, for example 256 or 512 bytes. However, at the drive or operating system level, multiple sectors are often grouped together in a cluster.

Sector and track use a process called low level format, where the starting and ending points of each sector are written on the platter. Process the hard disk to store blocks of bytes. After that, the high-level format process will include a storage strutur file, such as file-allocation table (FAT) in the sector. This process serves the hard disk to store files.

The development of hard disk from time to time always change. Hard disk at this time tend to be small but have a large capacity. However, the most common hard drives on the market are 250GB to 1TB hard drives.

Source : Wikipedia

Tags : Computer, Komputer