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STORAGE devices & media

STORAGE devices & media. GCSE Information. STORAGE devices. FLOPPY DISKS 1.44Mb (megabytes) storage capacity is quite limiting by today’s standards: how much space is needed for a 2 page Publisher piece which has a few basic bits of clip art included? Portable

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STORAGE devices & media

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  1. STORAGE devices & media GCSE Information

  2. STORAGE devices • FLOPPY DISKS • 1.44Mb (megabytes) storage capacity is quite limiting by today’s standards: how much space is needed for a 2 page Publisher piece which has a few basic bits of clip art included? • Portable • Can carry work easily from machine to machine (including carrying a virus….) • Easily damaged: store them on a speaker or on top of the monitor & contents will be erased • Water/food & floppy don’t mix….

  3. STORAGE devices • Hard Disks 10Gb (gigabyte) is normal 20Gb or higher available Non-volatile (i.e. when power Removed, contents are retained) Technical info on the web: click here

  4. STORAGE devices • CDROMs …CD-R … CD-RW… There are now countless games, software applications, encyclopaedias, presentations and other multimedia programs available on CD-ROM and what was originally designed to carry 74 minutes of high-quality digital audio can now hold up to 650MB of computer data, 100 publishable photographic scans, or even 74 minutes of VHS-quality full-motion video and audio. Many discs offer a combination of all three, along with other information besides. • Today’s mass produced CD-ROM drives are faster and cheaper than they’ve ever been. Consequently, not only is a vast range of software now routinely delivered on CD-ROM, but many programs (databases, multimedia titles, games and movies, for example) are also run directly from CD-ROM - often over a network. • They are quite robust – especially in comparison with floppy disks. • They are portable & now cheap (10 blank CDs cost around £5) • Useful for carrying around important data/work • Now CD WRITERS are cheaper, this becomes a cheap and economical way to store your work …. BACKUP YOUR WORK or risk TREMENDOUS LOSSES (time and money) Details on the web: click here

  5. STORAGE devices • DVD • DVD-5 is a single-sided single-layered disc boosting capacity seven-fold to 4.7GB • DVD-9 is a single-sided double-layered disc offering 8.5GB • DVD-10 will be a 9.4GB dual-sided single-layered disc • DVD-18 will increase capacity to a huge 17GB on a dual-sided dual-layered disc. Details on the web: click here

  6. STORAGE devices • TAPES and tape drives • Used for backing up • Capacities vary between 1Gb and 100Gb • There are different types of tape & drive: QIC, TRAVAN, DAT, DLT • Tape capacities quoted are compressed capacities: One function of backing up is to compress (shrink by mathematically calculating alternative ways of storing the data). In theory, the compression ration is 2:1. A 5Gb (native) tape then has a theoretical 10Gb capacity. In reality, the compression ration achieved is closer to 1.6:1. • Easy to handle, portable, vast capacities • Slow Details on the web: click here And for BACKUP information: click here

  7. STORAGE devices • ZIP drives and others Read the magazines and you will soon find alternative ways to save (store) your work. • IOMEGA ZIP drives use disks that are similar to a floppy disk but store up to 100Mb or 250Mb of data. They are good for saving work and carrying it with you from machine to machine. Clearly, a ZIP drive would be needed on each machine visited. • The ZIP drives are portable with USB versions for hot plug & play providing the operating system (e.g. Windows) supports USB devices. • ZIP drives are not too expensive either… Details on the web: click here

  8. STORAGE devices You need to be able to: • Discuss different devices and what they can be used for • Be aware of capacities and limitations • Be aware of costs • Know advantages and disadvantages for each

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