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Wednesday 21 December 2022

How is a computer hardisk?

 5 facts about hard disk

  A hard disk contains a number of objects.

  Hard disks normally have limited space.

  The world's smallest hard disk was invented by Dutch scientists in 2016.

  Hard disk is not airtight.

  Hard drives can be easily password protected.

Complete history of hard disk

  Considered as a hard disk, or hard drive and disk drive.  It is like a magnetic disk that is used to store and retrieve computer data.

  The first hard disk drive was produced by IBM in 1956 and shipped in 1957 as a component of the IBM 305 random access memory accounting system.  Originally designed as a 35 disk storage unit, the hard disk consisted of a magnetic disk memory unit.  Its access mechanism, electronic and pneumatic controls for the access mechanism and a small air compressor.

Assembled with cover in size, it was 150cm long, 170cm high and 73cm deep.  It was configured with 50 25-inch magnetic disks holding 50,000 sectors, each containing 100 alphanumeric characters, for a total capacity of 5 million characters.

  The disc rotated at 1300 rpm, recording tracks (20 by 10 inches) at 100 bits per inch.  Execution of the "seek" instruction places a read-write on the track containing the desired sector and selects the sector for subsequent read or write operations.  Search time averages 700 milliseconds.  IBM originally sold their first manufactured hard disk for $20,000 per megabyte.

During the first few decades of developing hard disk drives, IBM was a pioneer: in 1962, it invented heads for disk drives that "floated" on cushions of air or "air bearings". In 1964 it was the first removable head.  One such hard drive came with the 1311, which has a 13-inch platter and holds 2.5MB. In 1968, it introduced the first drive using a wound-coil ferrite recording head. In 1973, IBM released the 3340 or Winchester Direct Access Storage Facility.  The smaller and lighter 3340 marked the next natural evolutionary step in hard disk storage.

Hard Disk: How it works and why

  As mentioned earlier, hard disks save and retrieve computer data using magnetic storage.  Nowadays, almost all computers and servers have one or more hard disks, which preserve digital data relatively permanently due to the capabilities of these disks, which serve to remember the information even after your computer has lost power.

A hard disk is circular, and uses a flat disk called a platter, coated on a magnetic medium, which collects information as a magnetic pattern.  The platters are stacked and mounted on the spindle.  Driven by several motors attached to the spindle, the platter rotates at high speed Both of these electromagnetic read/write heads are used to read or write data from the disk platter.  The read/write head is mounted on an arm, whose position is controlled by an actuator.  The logic board controls the drive's activities and communicates with the connected computer system.

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  A hard disk stores data in binary code using 0s and 1s.  To store any information, the disk(s) spreads such information on its magnetic surface and is written and read by the read head immediately above the surface with the help of the air layer created by the rotation on the ultra-fast disk.

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