AQA A-Level Computer Science topics recap

Definition of storage

• holds data, instruction and information for future use

• is the process of transferring items from a storage medium into memory

• is the number of bytes a storage medium can hold

• measures the amount of time

Which is the Optical Storage

• DVD
• HDD
• SSD
• USB

Which type of storage has moving parts?

• Hard Disk Drive
• Flash Drive
• DVD
• Solid State Drive

Magnetic disks are organised into.....

• circles and wedges
• sectors and tracks
• chunks and stretches
• disks and docks

A disadvantage of hard drives is

• They have moving parts
• They are volatile
• They don't last long
• They are hard to use

Optical storage uses what for 0s and 1s

• Pits and pots
• Pits and lands
• Highs and Lows
• Light and dark

Solid State Drives use

• Non Volatile Flash Memory
• Volatile Flash Memory
• Volatile Storage Memory
• Non Volatile Magnetic Memory

Storage medium is nonvolatile. What is nonvolatile?

• It is lost when computer's power is turned off

• Can be read from and written to by processor

• Contents retained when power is off

• Is the process of transferring items from memory to a storage medium

Flash memory stores 0s and 1s as

• Trapped electrons 
• Trapped Protons
• Magnetic Particles
• Light and dark

Which optical storage device has an average memory size of around 4.7GB?

• CD

• DVD

• Blu-Ray

• USB flash drive