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3.1 Storage

3.1 Storage. Overview. Compare the following storage devices in terms of storage capacity, cost, speed of data retrieval and suitability for specific purposes: Hard disk DVD CD-RW CD-ROM/CDR Blu-ray Tape streamer Flash media. Units of Storage. Bit Byte MB – Megabyte

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3.1 Storage

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  1. 3.1 Storage

  2. Overview Compare the following storage devices in terms of storage capacity, cost, speed of data retrieval and suitability for specific purposes: Hard disk DVD CD-RW CD-ROM/CDR Blu-ray Tape streamer Flash media

  3. Units of Storage • Bit • Byte • MB – Megabyte • GB – Gigabyte

  4. Hard disk • Main storage device in most computer systems • Magnetic storage device • A number of disks one on top of the other in a sealed unit • Lacks portability • Holds a lot of information

  5. Digital Versatile Disk • Looks like a CD • Requires a DVD drive • Typical storage capacity 17GB

  6. CD-RW • CD Rewriteable • Can be written to and erased many times • More expensive than a CD-R • Needs a CD-RW drive

  7. CD-ROM • Compact Disk Read Only Memory • Information cannot be erased • Typical storage is 650MB • Faster access than a floppy access • More robust than a floppy disk

  8. Blu-ray • An optical storage medium • Huge capacity • Do not necessarily need special equipment to read them • Popular applications are the storage of video and high definition graphics

  9. Tape Streamer • Digital audio tape • A magnetic medium • Serial access medium • Has a huge storage capacity typically 60GB • Used for backup

  10. Flash Media • Non-volatile computer storage • Can be electrically erased and reprogrammed. • Usual applications are memory cards and USB flash drives

  11. Network storage Network administrator backs it up Peripherals can be shared Local storage Up to the individual to back it up Every system needs its own peripherals Network storage v Local storage

  12. Acronyms • MB Megabyte • GB Gigabyte • DVD Digital Versatile Disk • CD Compact Disk • CD-R Compact Disk Recordable • CD-ROM Compact Disk Read Only memory • DAT Digital Audio Tape

  13. Associated words • Primary storage • Secondary storage • Serial access • Direct access • Optical storage • Magnetic storage • Backing store

  14. Complete the following:

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