Computing revison

Computing revison

1. cribs

   • Boolean
     • Stores 2 possible values (True or False / Yes or No). Example: is running = True
   • String
     • Can contain numbers, letters and symbols. Example: password = “@rChi3@ll@11”
   • Integer
     • Any whole number used for calculations. Example: lives = 4
   • Real
     • Any number with a decimal point used for calculations. Example: cost = £9.99
   • Character
     • A single letter, number or symbol. Example: gender = “M”

2. secondary storage

   • Optical storage
     • Is any storage method in which data is written and read with a laser. CDs, DVDs and Blu-Ray are examples of this type of storage.
       • advantages
         • Cost effective and very portable
       • disadvanteges
         • Not very durable and has a limited capacity
   • Magnetic storage
     • Data is stored by magnetising the surface of flat, circular plates called platters. These platters rotate at a very high speed.
       • advantages
         • Cost effective due to having a larger capacity than solid state.
       • disadvantages
         • Not as durable due to moving parts and reads/writes data slower in comparison to solid state.
   • Solid state
     • Uses microchips to store data instead of magnetised disks and do not contain any moving parts.
       • advantages
         • More durable and can read and write data much faster than magnetic storage. It is also more energy efficient.