OCR GCSE - Computer Science - Paper 1 - Types of Storage

Question	Answer
What is Magnetic Storage?	> Type of secondary storage (non-volatile) > Read/write head moves across the surface of a spinning disk / tape > Head magnetises / demagnetises a section of the disk / tape > Magnetised / demagnetised parts represent binary data
What are some Examples of Magnetic Storage?	> Hard Disk Drive (HDD) > Tapes (VHS, Cassettes etc.)
What are the Advantages and Disadvantages of Magnetic Storage?	> Cheap > High Capacity --------------------- > Easily broken / damaged (non-durable) > Not reliable - magnets can erase data
What is Optical Storage?	> Type of secondary storage (non-volatile) > Laser scans the surface of the disc, made from metal and plastic > Laser marks hollows and pits on tracks on the disk > Hollows and pits represent binary data
What are some Examples of Optical Storage?	> CDs > DVDs > Blu-Rays
What are the Advantages and Disadvantages of Magnetic Storage?	> Relatively Cheap > Extremely Portable --------------------- > Limited (not low) Capacity > Easily Damaged / Scratched (not durable)
What is Solid State Storage?	> Type of secondary storage (non-volatile) > Type of flash memory > Transistors / switches represent binary data > No moving parts
What are some Examples of Solid State Storage?	> USB Drive > Solid State Drive (SSD) > SD Card
What are the Advantages and Disadvantages of Solid State Storage?	> Extremely High Transfer Speeds > Durable and Reliable > Portable --------------------- > High Cost

Resource summary

	Created by Malachy Moran-Tun about 4 years ago