Tuesday 18 October 2016

Chapter 8 : Types of Storage

Storage
Storage holds data, instructions, and information for future use. A storage medium is the physical material on which a computer keeps data, instructions, and information.

  • Capacity is the number of  bytes a storage medium can hold.
  • A storage device is the computer hardware that records and/or retrieves items to and from storage media. Reading is the process of transferring items from a storage medium into memory. Writing is the process of transferring items from memory to a storage medium.
Hard Disks

  • A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information.
  • Formatting is the process of dividing the disk into tracks and sectors so that the operating system can store and locate data and information on the disk.
Flash Memory Storage

  • Flash memory chips are a type of solid state media and contain no moving parts.
  • A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader.
  • USB flash drives plug into a USB port on a computer or mobile device.
Cloud Storage

  • Cloud storage is an Internet service that provides storage to computer users for variety of reasons such as : Access file from any computer, Store large files instantaneously, Allow others to access their files.
Optical Discs
  • An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser.
  • Typically store software, data, digital photos, movies, and music.
Other types of storage
  • Tape is a magnetically coated ribbon of plastic capable of storing large amounts of data and information.
  • A tape drive reads and writes data and information on a tape.
  • A magnetic stripe card contains a magnetic stripe that stores information.
  • A smart card stores data on a  thin microprocessor embedded in the card.
  • Microfilm and microfiche store microscopic images of documents on a roll or sheet film.

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