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Flashcards

Unit 1.3 Storage Revision

Karolina Rawdanowicz Inglês 5,0Avaliação média 5,0 de 5 (1 avaliação) 16 flashcards

Flashcards do conjunto (16)

  1. 1What is Secondary Storage?An auxiliary device that is not always connected to power.
  2. 2Why do we need Secondary Storage?So we don't need to install storage every time we want to use it and to save and backup files and data.
  3. 3Optical StorageA laser light reads marks in a pattern on a disk and translates into a readable format.
    eg. DVD ROM
    Reliable
  4. 4MagneticMove across a medium and change how magnetized that area is.
    eg. Hard Drive
    Cost effective
  5. 5Solid StateMade of switches and and the state determines whether a 0 or a 1 is stored.
    eg. USB stick
    Flexible
  6. 6Non Volatile and Volatile StorageROM is non volatile and RAM is volatile because ROM doesn't need constant power to store data but RAM does.
  7. 7CapacityHow much data it can store.
    Magnetic has the biggest capacity.
  8. 8SpeedHow fast it can access data.
    Solid state is the fastest.
  9. 9PortabilityHow easy it is to move from one place to another.
    Solid state is the most portable.
  10. 10DurabilityHow well it can last.
    Solid state is the most durable.
  11. 11ReliabilityHow consistently it performs.
    Solid state is the most reliable.
  12. 12CostHow much it costs per KB, MB or GB.
    Magnetic is the cheapest medium.
  13. 13Size of Text Files1 KB is approximately 1000 bytes.
    1 byte per character +10% for any overheads (eg. file type)
    eg.
  14. 14Database1. How many bytes in one record
    2. Multiply by number of records
    3. Add 10% for overheads
    Text : 1 byte per character
    Integer : 4/8 bytes
    Real : 4/8 bytes
    Boolean : 1 byte
    Date : 8 bytes
  15. 15Image(Number of pixels x number of bytes per pixel) + 10% for overheads
    eg. If an image is 1024 x 720 pixels and it has 256 different colours it has 8 bits per pixel because with 8 bits you can have 256 different combinations.
  16. 16SoundbytesPerSample x samples PerSecond x channels x duration
    eg. a sound file has 2 bytes per sample, it takes 10 samples per second over 2 channels and is 30 seconds long.

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FlashCards sobre Unit 1.3 Storage Revision, criado por Karolina Rawdanowicz em 18-12-2017.
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Avaliação média 5,0 de 5 (1 avaliação)

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