Hard disk (HDD), hard disk , hard drive or fixed drive is a data storage device used for data gathering and subsequent reading. There are multiple discs on a hard disk. Call it Platters. They are covered with magnetic metal. Platters are combined with magnetic head or head. There is another active acupuncture arm or hand with them. This acupuncture is used to read information and to store data from the surface of the hands platelets . The data is transferred to the drive based on the random-access process. This means that data is stored in the drive when it is not sorted later, but data is stored in any empty space. Hard disk drive keeps the data even after the computer is shut down.
IBM first invented hard disks in 1956 and in the 1960s computers were being used as computers for the second storage medium. As a result of its development, its usage from today's day server to personal computers is noteworthy. Currently, most computers use hard disks as a non-volatile system. In addition to hard disks, digital video recorders, music players, etc. are now using hard disks. More than 200 companies of this company have prepared this drive several times. Currently it is being prepared by several reputable companies, including Segate, Toshiba and Western Digital. In 2013, worldwide disk storage revenue was $ 32 billion, which was 3% lower than in 2012.
The primary feature of a hard drive is its capacity and efficiency. Capacitance is to be noted that the 1000-gb capacity of 1- terabyte drive is 1000 gigabytes. Not all of this capability are completely user-friendly, because the filesystem and computer's operating system and internal space are used for error correction and recovery. Functionality is meant to be on the hard drive's access time and latency properties. Access time is how often a head goes to a specific track or cylinder and the latency is the amount of time that a sector falls below the head. Latency issue is the rotational speed of the hard drive, which is the revolutions per minuteIt is related to what it is measured with. Also, the speed at which data transfer ( data rate ) is at the speed of the hard drive is considered as one of the features.
Two structures of modern hard drives are often seen. 3.5 inches and 2.5 inches The 3.5-inch drive is available for the desktop and 2.5 inches on the laptop. Hard drives are connected by standard interface cable such as a warranty , sata , USB or serial attached SCSI cable. Early hard discs were removable media, but current hard disks are usually bound in metal boxes.
According to the 2015 data, the hard drive's main competitive technology is the flash memory that comes with Solid State Drive (SSD) technology. They have high speed data transfer capability and high reliability . And their latency time and access time less. However, hard drives are still low prices and the efficiency of the device's storage capacity has become dominant as a secondary data storage system. Again, SSDs, where speed, power utilization and stability are important, are considered first.
