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Computer Science · Oct / Nov 2020 · Paper 12 · Question 3

0478

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The question as text

Alessandro has some important data stored on his computer. He is concerned about accidental damage to his data.

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Show the answer and mark scheme

  • 3(a)(i)[3]

    Any three from:

    Loss of power/electricity
    Spillage of liquids
    Flood
    Fire
    Human error
    Hardware failure
    Software failure

    NOTE: Three different types of human error can be awarded e.g. accidental deletion, not saving data, incorrect shutdown procedure

  • 3(a)(ii)[1]

    Create a backup

  • 3(b)[4]

    Max three from:

    Solid state drive
    Non-volatile
    Secondary storage
    Flash memory
    Has no mechanical/moving parts
    Uses transistors
    … and cells that are laid out in a grid
    Uses control gates and floating gates
    Can be NAND/NOR (technology)
    Use EEPROM technology

    Max two from:

    Stores data by flashing it onto the chips
    Data stored by controlling the flow of electrons through/using transistors/chips/gates
    The electric current reaches the control gate and flows through to the floating gate to be stored
    When data is stored the transistor is converted from 1 to 0

  • 3(c)[6]

    One mark for each correct row:

    Blu-ray

    CD

    DVD

    Statement

    (✓)

    (✓)

    (✓)

    A type of optical storage

    Has the largest storage capacity
    Can be dual layer
    Read using a red laser
    Has the smallest storage capacity
    Stores data in a spiral track
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