Topic 2

• Name two magnetic storage types?

  Hard drives

  Hard disks
• Name two solid state types?

  USB Stick

  SD Card
• Name two Optical types?

  DVDs

  Blu Ray
• Data conversions:

  Bit

  Nibble (4 bits)

  Byte(8 bits)

  Kilobyte(1000 bytes)

  Megabyte(1000 KB)

  Gigabyte(1000 MB)

  Terabyte(1000 GB)

  Petabyte(1000 TB)
• Name two character sets?

  ASCII

  UNICODE
• What is Sample Rate?

  How many measurements of sound taken each second.
• How do you calculate Sound File Size (in bits)?

  Sample Rate x Bit Depth x Channels x Time. (If stuck in the exam times everything together).
• What is Colour Depth?

  Amount of colours available to each pixel.
• What is the resolution?

  Amount of pixels that make up an image.
• What would the file size be with dimensions of 500x250 and a colour depth of 3 bits?

  (500 x 250) x 3 = 375,000
• What is the Bit rate?

  How many bits of data processed every second.
• What is Secondary storage?

  Allows data to be stored permanently. NON-VOLATILE
• What are Characteristics of Solid State?

  Medium Capacity

  Very fast to read and access data

  Portable

  No moving parts so durable

  Reliable

  Expensive per GB
• What are characteristics of magnetic?

  Large capacity

  Not as fast as solid state

  Not very portable

  has moving parts so not durable

  Cheap per GB
• Characteristics of Optical?

  Low capacity

  slow speed

  Very portable

  Can be scratched easily

  Cheap per GB
• What is the value of A in ASCII?

  65