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CP1610: Introduction to Computer Components

CP1610: Introduction to Computer Components. Archival Storage Devices. What is Archival Storage?. Similar to secondary storage. Typically more durable. Used for long-term or permanent storage: Data backups from hard disks;

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CP1610: Introduction to Computer Components

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  1. CP1610:Introduction to Computer Components Archival Storage Devices

  2. What is Archival Storage? • Similar to secondary storage. • Typically more durable. • Used for long-term or permanent storage: • Data backups from hard disks; • Permanent storage of data that will not be changed (ex: music or movies);

  3. Common Archival Storage Media • Optical Storage • Flash Memory • Magnetic Storage

  4. Optical Storage • Use light (lasers) to read and write data. • Not subject to data loss or corruption. • Compact Discs (CD’s) • Digital Video Disks (DVD’s)

  5. How Optical Storage Works • Light is used to burn a series of ‘pits’ (dark spots) on a disk. • Dark spots and light spots are read as 0’s and 1’s (binary). • Re-writable discs use ‘Phase’ technology: • Special dyes are used that react to the laser; • The ‘Phase’ of the dyes can be changed to change the data.

  6. Data Storage on Optical Media • CD-ROM drives • Use CDFS (Compact Disc File System) or UDF (Universal Disk Format); • Hold about 780 MB of data. • DVD drives • Use only UDF; • Uses the MPEG-2 encoding standard; • Standard hold about 4.5 GB of data. • Dual-layered DVD’s can hold up to 8.5 GB of data.

  7. Optical discs have tracks and sectors, just like magnetic disks. • Tracks and sectors are arranged in a spiral, instead of concentric circles. Floppy Disk

  8. Flash Memory • Also called solid-state storage. • No moving parts (Data on the media is altered using electrical signals). • Relatively high memory capacity. • Commonly used for: • USB drives; • MP3 players; • Digital camera memory; • Mobile phone and PDA memory;

  9. Multimedia Compression Standards • MPEG-1 standard • Image compression for business/home applications • MPEG-2 standard • Video film compression on DVD-ROM • MPEG-3 standard • Audio compression • MPEG-4 standard • Video transmissions over the Internet

  10. Magnetic Storage • Like a cross between a floppy or hard disk, and an audio cassette. • Stores data by aligning magnetic particles on a ‘tape.’ • Magnetic particles are read as 0’s or 1’s (binary).

  11. Advantages of Magnetic Storage • Advantages • Inexpensive and convenient • Large capacity • Several types and formats • Disadvantage • Sequential access

  12. Other Archival Storage Media • ZIP Disks (By Iomega) and SuperDisks (by Imation). • Similar to 3.5 inch floppy disks, but bigger, with more capacity. • Never became popular because of CD’s and DVD’s

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