What are the 3 tiers of storage? - Primary storage, secondary storage, tertiary storage., Name some examples of secondary storage. - Magnetic Hard Drives and Solid-State Hard Drives., How does the speed of primary storage compare to secondary? - It is much faster., Name four main parts of a hard disc drive. - Data track; sectors ; read; write head; moveable arm, What physical properties does the traditional hard drive use to store 1's and 0's. - It uses magnetism to store 0's and 1's., What are the advantages and disadvantages of Magnetic hard drives? - They are relatively cheap and reliable, they are not robust though so if dropped they will get bad sectors., What are the advantages and disadvantages of SSD hard drives? - They are very fast and as they have no moving parts they are robust. They only have a finite number of read and write actions (although it a large number it is less than a HDD). They are also usually smaller and lighter but have a smaller capacity than traditional HDD., What type of memory does an SSD use? - They use flash memory., Name some examples of optical drives: - CD's DVD's and Blu-ray, Explain the basic working of a CD use the terms laser, data pits and reflection. - The laser shines onto a "land" in which case it is reflected back to a sensor, the detection of the light at the sensor is read as a logic "1", if the light hits a pit on the disc then it is scattered , the senor doesn't receive the light and it is read as a logic "0", What are the advantages of using optical discs? - They are very cheap and portable, they are not damaged by water or static shocks., What are the disadvantages of using optical discs? - They are extremely slow and can be damaged by scratches. They have relatively a small capacity, What is the capacity of a CD-ROM, DVD and Blu-Ray disc? - 700MB; 4.7GB and 25Gb respectively.,

1.3 [Storage]

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