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A disassembled and labeled 1. HDD lying atop a mirror. An overview of how HDDs work. A hard disk drive HDD, hard disk, hard drive or fixed diskb is a 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 1. HDDs became the dominant secondary storage device for general purpose computers by the early 1. Continuously improved, HDDs have maintained this position into the modern era of servers and personal computers. More than 2. 00 companies have produced HDDs historically, though after extensive industry consolidation most current units are manufactured by Seagate, Toshiba, and Western Digital. HDD unit shipments and sales revenues are declining, though production exabytes per year is growing. Flash memory has a growing share of the market for secondary storage, in the form of solid state drives SSDs. SSDs have higher data transfer rates, higher areal storage density, better reliability,7 and much lower latency and access times. Though SSDs have higher cost per bit, they are replacing HDDs where speed, power consumption, small size, and durability are important. The primary characteristics of an HDD are its capacity and performance. Capacity is specified in unit prefixes corresponding to powers of 1. TB drive has a capacity of 1,0. GB where 1 gigabyte 1 billion bytes. Typically, some of an HDDs capacity is unavailable to the user because it is used by the file system and the computer operating system, and possibly inbuilt redundancy for error correction and recovery. Performance is specified by the time required to move the heads to a track or cylinder average access time plus the time it takes for the desired sector to move under the head average latency, which is a function of the physical rotational speed in revolutions per minute, and finally the speed at which the data is transmitted data rate. The two most common form factors for modern HDDs are 3. HDDs are connected to systems by standard interface cables such as PATA Parallel ATA, SATA Serial ATA, USB or SAS Serial Attached SCSI cables. Historyedit. Video of modern HDD operation cover removedThe hard disk drives was initially developed as data storage for an IBM real time transaction processing computer which became the IBM 3. RAMAC. 2. 7, IBM announced HDDs in 1. IBM 3. 05 RAMAC system and as new component to enhance the existing IBM 6. The first IBM drive, the 3. RAMAC in 1. 95. 6, was approximately the size of two medium sized refrigerators and stored five million six bit characters 3. In 1. 96. 2 the IBM 3. RAMAC disk storage unit was superseded by the IBM 1. Whereas the IBM 3. Cylinder mode readwrite operations were supported, and the heads flew about 2. Motion of the head array depended upon a binary adder system of hydraulic actuators which assured repeatable positioning. The 1. 30. 1 cabinet was about the size of three home refrigerators placed side by side, storing the equivalent of about 2. Access time was about a quarter of a second. Also in 1. 96. 2, IBM introduced the model 1. Users could buy additional packs and interchange them as needed, much like reels of magnetic tape. Later models of removable pack drives, from IBM and others, became the norm in most computer installations and reached capacities of 3. Non removable HDDs were called fixed disk drives. Some high performance HDDs were manufactured with one head per track e. IBM 2. 30. 5 in 1. Known as fixed head or head per track disk drives they were very expensive and are no longer in production. In 1. 97. 3, IBM introduced a new type of HDD code named Winchester. Its primary distinguishing feature was that the disk heads were not withdrawn completely from the stack of disk platters when the drive was powered down. Instead, the heads were allowed to land on a special area of the disk surface upon spin down, taking off again when the disk was later powered on. This greatly reduced the cost of the head actuator mechanism, but precluded removing just the disks from the drive as was done with the disk packs of the day. Instead, the first models of Winchester technology drives featured a removable disk module, which included both the disk pack and the head assembly, leaving the actuator motor in the drive upon removal. Later Winchester drives abandoned the removable media concept and returned to non removable platters. Like the first removable pack drive, the first Winchester drives used platters 1. A few years later, designers were exploring the possibility that physically smaller platters might offer advantages. Drives with non removable eight inch platters appeared, and then drives that used a 5 14 in 1. The latter were primarily intended for the then fledgling personal computer PC market. As the 1. 98. 0s began, HDDs were a rare and very expensive additional feature in PCs, but by the late 1. Most HDDs in the early 1. PC end users as an external, add on subsystem. The subsystem was not sold under the drive manufacturers name but under the subsystem manufacturers name such as Corvus Systems and Tallgrass Technologies, or under the PC system manufacturers name such as the Apple Pro. File. The IBM PCXT in 1. MB HDD, and soon thereafter internal HDDs proliferated on personal computers. External HDDs remained popular for much longer on the Apple Macintosh. Many Macintosh computers made between 1. SCSI port on the back, making external expansion simple. Older compact Macintosh computers did not have user accessible hard drive bays indeed, the Macintosh 1. K, Macintosh 5. 12. K, and Macintosh Plus did not feature a hard drive bay at all, so on those models external SCSI disks were the only reasonable option for expanding upon any internal storage. The 2. 01. 1 Thailand floods damaged the manufacturing plants and impacted hard disk drive cost adversely between 2. Driven by ever increasing areal density since their invention, HDDs have continuously improved their characteristics a few highlights are listed in the table above. At the same time, market application expanded from mainframe computers of the late 1. TechnologyeditMagnetic recordingeditA modern HDD records data by magnetizing a thin film of ferromagnetic materiale on a disk. Sequential changes in the direction of magnetization represent binary data bits. The data is read from the disk by detecting the transitions in magnetization. User data is encoded using an encoding scheme, such as run length limited encoding,f which determines how the data is represented by the magnetic transitions. A typical HDD design consists of a spindle that holds flat circular disks, also called platters, which hold the recorded data. The platters are made from a non magnetic material, usually aluminum alloy, glass, or ceramic, and are coated with a shallow layer of magnetic material typically 1.