COMPUTER STORAGE
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Computer storage devices hold data permanently even when the computer is turned off. There are two main categories of storage devices: magnetic storage and optical storage. Magnetic storage uses magnetic media like hard drives, floppy disks, and tape to store data through magnetic encoding. Optical storage uses optical discs like CDs, DVDs, and Blu-ray discs to store data through making physical marks readable with laser light. Storage devices have evolved significantly over time to increase capacity and portability.
COMPUTER STORAGE
- 1. Page 1 CHAPTER 4 (Computer Storage)
- 2. Page 2 COMPUTER STORAGE • A computer can function with only processing, memory, input, and output devices. To be really useful, however, a computer also needs a place to keep program files and related data when they are not in use. • The purpose of STORAGE is to hold data permanently
- 3. Page 3 COMPUTER STORAGE CATEGORIES • The purpose of storage devices is to hold data – even when the computer is turned off – so data can be used whenever it is needed. • Storage involves 2 Processes: 1. WRITING DATA – or recording data on the surface of a disk or tape -- where it is stored for later use. 2. READING DATA – or retrieving the data from the surface of a disk or tape -- and then transferring it into the computer’s memory.
- 4. Page 4 • STORAGE MEDIA – The Physical materials on which the data is stored • STORAGE DEVICES – The Hardware components that write data to, and read it from storage media. • DISK DRIVE – The device that holds the disk COMPUTER STORAGE TERMS
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- 6. Page 6 1. MAGNETIC STORAGE 2. OPTICAL STORAGE 2 MAIN CATEGORIES OF STORAGE DEVICES
- 7. Page 7 • Magnetic storage and magnetic recording are terms from engineering referring to the storage of data on a magnetized medium. • Magnetic storage uses different patterns of magnetization in a magnetizable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads. As of 2009, magnetic storage media, primarily hard disks, are widely used to store computer data as well as audio and video signals. • In the field of computing, the term magnetic storage is preferred and in the field of audio and video production, the term magnetic recording is more commonly used. MAGNETIC STORAGE
- 8. Page 8 EXAMPLES OF MAGNETIC STORAGE MEDIA
- 9. Page 9 HARD DRIVE • A hard disk drive (hard disk, hard drive,HDD) is a non-volatile storage device for digital data. • It features one or more rotating rigid platters on a motor-driven spindle within a metal case. • Data is encoded magnetically by read/write heads that float on a cushion of air above the platters.
- 10. Page 10 FLOPPY DRIVE • A floppy disk is a data storage medium that is composed of a disk of thin, flexible ("floppy") magnetic storage medium encased in a square or rectangular plastic shell. • Originally announced as the "Type 1 Diskette" by IBM in 1973, the industry then adopted the terms "floppy disk" or "floppy."
- 11. Page 11 DATA TAPE BACK-UP • A tape drive is a data storage device that reads and writes data on a magnetic tape. It is typically used for off-line, archival data storage. • Tape media generally has a favorable unit cost and long archival stability. • A tape drive provides sequential access storage, unlike a disk drive, which provides random access
- 12. Page 12 MINI DV TAPE • DV is a format for recording and playing back digital video. • It was launched in 1995 with joint efforts of leading producers of video camera recorders.
- 13. Page 13 MAGNETIC STRIPE CARD • A magnetic stripe card is a type of card capable of storing data by modifying the magnetism of tiny iron- based magnetic particles on a band of magnetic material on the card. • The magnetic stripe, sometimes called a magstripe, is read by physical contact and swiping past a reading head.
- 14. Page 14 OPTICAL STORAGE • Optical storage is a term from engineering referring to the storage of data on an optically readable medium. • Data is recorded by making marks in a pattern that can be read back with the aid of light. • A common modern technique used by computers involves a tiny beam of laser light precisely focused on a spinning disc. • Optical storage differs from other data storage techniques that make use of other technologies such as magnetism or semiconductors. • The term optical drive usually refers to a device in a computer that can read CD-ROMs or other optical discs.
- 15. Page 15 EXAMPLES OF OPTICAL STORAGE MEDIA
- 16. Page 16 FLASH MEMORY CARD • is an electronic flash memory data storage device used for storing digital contents. They are commonly used in many electronic devices, including digital cameras, mobile phones, laptop computers, MP3 players, and video game consoles. They are small, re-recordable, and they can retain data
- 17. Page 17 USB FLASH DRIVE • A USB flash drive consists of a flash memory data storage device integrated with a USB (Universal Serial Bus) 1.1 or 2.0 interface. • USB flash drives are typically removable and rewritable, and physically much smaller than a floppy disk
- 18. Page 18 DVD–ROM • DVD, also known as Digital Video Disc or Digital Versatile Disc, is an optical disc storage media format, and was invented and developed by Philips, Sony, Toshiba, and Time Warner in 1995. • Its main uses are video and data storage. DVDs are of the same dimensions as compact discs (CDs), but are capable of storing more than six times as much data.
- 19. Page 19 CD–ROM • CD-ROM "compact disc read-only memory") is a pre-pressed compact disc that contains data accessible to, but not writable by, a computer for data storage and music playback, the 1985 “Yellow Book” standard developed by Sony and Philips adapted the format to hold any form of binary data.
- 20. Page 20 COMPUTER STORAGE EVOLUTION