COMPUTER SCIENCE
- Created by: jodytideswell
- Created on: 15-04-16 14:05
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- Computer Science
- CPU
- Decode
- Fetch
- Moves data from memory locations
- Execute
- Runs programs
- MHZ
- Clock Speed
- Cycles per second
- Clock Speed
- Dual/Quad core
- Two/four cores
- 2/4 times as much at once
- Two/four cores
- DATA PROTECTION ACT
- Obtained and processed fairly and lawfully
- Kept for a purpose
- Accurate and up to date
- Relevant
- Kept secure against unauthorised access
- Processed in accordance with the rights of the subject
- Not kept longer than neccessary
- Not transferred outside of the EU
- MEMORY
- CACHE
- Needed to access frequently used programs
- Close to CPU
- Fast access
- Close to CPU
- Expensive
- Needed to access frequently used programs
- ROM
- Non-volatile
- Bootstrap Loader
- Non-volatile
- VIRTUAL
- Part of the hard drive
- Behaves like RAM - when RAM is full
- So programs and data can still run without crashing when RAM is full
- RAM
- Volatile
- Data and programs currently being used
- Volatile
- CACHE
- STORAGE UNITS
- BIT
- NIBBLE
- BYTE
- KILOBYTE
- MEGABYTE
- GIGABYTE
- TERABYTE
- 1024 gigabytes
- TB
- 1024 gigabytes
- 1024 megabytes
- GB / gbyte
- TERABYTE
- 1024 kilobytes
- MB / mbyte
- GIGABYTE
- 1024 bytes
- kB / kbyte
- MEGABYTE
- 8 bits
- 2 nibbles
- A single keyboard character
- KILOBYTE
- 4 bits
- BYTE
- 1 binary digit
- NIBBLE
- BIT
- SECONDARY STORAGE
- Factors
- Speed
- Reliability
- Portability
- Capacity
- Durability
- Optical
- Compact Disk (CD) and Digital Versatile Disk (DVD)
- Direct Access
- Cheap to produce
- Quite portable
- Easily damaged - not v. durable
- Medium capacity
- Compact Disk (CD) and Digital Versatile Disk (DVD)
- Solid State
- Flash Drive
- USB sticks, memory cards for cameras, SD cards (mobiles) etc.
- Fast Access
- Direct access
- 2 GB or more
- Quite expensive per byte
- Very portable
- Very durable
- Very reliable
- Flash Drive
- Magnetic
- Hard disk
- Direct Access
- Internal is faster than external - both fast access
- Terabyte or more
- External - portable
- Very reliable - detects bad areas and doesn't write on them.
- Very cheap per byte
- Magnetic tape
- Large capacity
- Serial access - slow
- Cheapest storage per byte
- Not very portable
- Hard disk
- Online Storage
- Can be recovered if there is theft/fire
- Can share files with others
- Can be accessed from anywhere
- Network storage
- Any computer on the network can use the storage space
- Factors
- CPU
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