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Published byBertha Allison Modified over 9 years ago
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3.1 Storage
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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-RWCD-ROM/CDR Blu-ray Tape streamer Flash media
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Units of Storage Bit Byte MB – Megabyte GB – Gigabyte
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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
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Digital Versatile Disk Looks like a CD Requires a DVD drive Typical storage capacity 17GB
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CD-RW CD Rewriteable Can be written to and erased many times More expensive than a CD-R Needs a CD-RW drive
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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
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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
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Tape Streamer Digital audio tape A magnetic medium Serial access medium Has a huge storage capacity typically 60GB Used for backup
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Flash Media Non-volatile computer storage Can be electrically erased and reprogrammed. Usual applications are memory cards and USB flash drives
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Network storage v Local storage 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
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Acronyms MBMegabyte GBGigabyte DVDDigital Versatile Disk CDCompact Disk CD-RCompact Disk Recordable CD-ROMCompact Disk Read Only memory DATDigital Audio Tape
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Associated words Primary storage Secondary storage Serial access Direct access Optical storage Magnetic storage Backing store
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Complete the following: CapacityCostSpeed of data retrieval Application DVD Hard disk CD-ROM Flash memory Floppy disk Tape streamer
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