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14 Cards in this Set
- Front
- Back
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What is secondary storage and why do we need it? |
Secondry storage is the devices used to store programs, docs and files. These are non-volatile so files can be stored without power being supplied. |
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What is magnetic storage? |
Magnwtic storage such as hard drives contain spinning magnetic discs, accessed by an arm that read/writes data. |
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Advantages of mag storage... |
-High capacity at low cost -fast data access |
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Disadvantages of mag storage... |
-the disk will fail over time -easily damaged (corruption of data) -large physical size -complex moving parts |
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Common uses of mag storage... |
-desktop PCs -network storage -system backups -large document files |
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Optical storage |
A track of pits goes from the centre to the edge of the disc. This is read by a laser into binary that contains the data stored. |
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Advantages of optical storage... |
-cheap to produce -very portable -widely available |
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Disadvantages to optical storage... |
-Discs can be damaged easily and degrade over time -limited capacity -compatability issues between players. |
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Common uses of optical storage... |
-storing music, videos and games -CD -DVD -Blu-ray |
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SSD storage |
A grid of electrical cells divided into sections (called pages) and then into blocks are used to send and recieve data. |
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Advantages of ssd... |
-faster read/write than mag storage -small physical size -no moving parts -ideal for USB and other portable devices |
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Disadvantages of ssd... |
-more expensive per Gb than mag or optiacl storage -can wear down over time |
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Common uses of ssd... |
-USB portable drives -smartphone amd digital camera memory -laptop hard drives |
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What characteristics can be used to compare secondary storage |
Capacity, speed, portability, durability, reliability and cost. |
