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A hard disk or hard drive (in English hard disk drive) is a non-volatile device, which retains information even with the loss of energy, which uses a system of digital magnetic recording . Inside the case is a series of stacked metal plates spinning at high speed. Dishes are placed on the heads in charge of reading or writing magnetic impulses. There are different standards to communicate a computer hard drive, the most common interfaces are Integrated Drive Electronics (IDE, also called ATA), SCSI generally used in servers, SATA , the latter standard in the year 2004 and FC only for servers.

As shipped, the hard disk can not be used by an operating system. Before you should define him as a low-level format , one or more partitions and then we give them a format that can be understood by our system.

There is another type of disc called solid state using a certain type of memory semiconductor built to store information. The use of such records is generally limited to SuperC omputer of its high price, even today and can be found on the market much more affordable units of low capacity (up to 512 ^{[ 1 ]} GB) for use on personal computers (especially laptops). Thus, RAM cache Within a solid state hard drive. track is a solid state memory, such

His translation of English is hard drive, but this term is rarely used because of the practicality of the term of a lesser extent hard disk (or disk rigid).

SATA HDD

Serial ATA or SATA ( acronym of Serial Advanced Technology Attachment) is an interface for transferring data between the motherboard and some storage devices , such as the hard disk, or other high performance devices are still being developed. Serial ATA replaces the traditional Parallel ATA or P-ATA . SATA provides faster speeds, better use when multiple disks, longer length of cable for data transmission and the ability to hot-plug disks (with the computer on.)

is now a widely accepted and standardized interface on the PC motherboard. The Serial ATA International Organization (SATA-IO) is the group responsible for developing, managing and driving the adoption of Serial ATA standard specifications. The SATA interface users benefit for better speed, upgradeable storage devices more simple and easier configuration. The SATA-IO objective is to drive industry adoption of SATA defining, developing and setting the standard specifications for the SATA interface.

EXTERNAL HARD DRIVE

A portable hard drive (or external hard drive ) is a hard disk that is easily transportable from one side to another.

Since the CD-R and CD-RW is have spread like cheap storage, it has changed the philosophy of having the same type of storage for both exchangeable disk storage to backup or disposal. Before they were usually magnetic disks or magneto-optical . Now it tends to have the optical storage for later use final and interchangeable medium without disks for transport. This is the case of USB memory and portable hard drives.