Systems Architecture

2. A magnetic storage drive which can store large amounts of data and is often the main method of secondary storage in personal computers. The drive contains a number of internal disks and a read/write head used to read and write data.
4. The contents are lost when the computen is turned off.
5. The smallest unit of storage, containing a binary 1 or 0.
6. A secret word or phrase, usually provided alongside a username, to control access to a system or network.
11. A number less than 0.
12. Used to store prograns for embedded system.
13. A number greater than 0.
15. This prevents traffic from unauthorised devices or using unauthorised protocols from passing through.

1. A single symbol, for example a letter, number or punctuation mark.
3. Space on the computer's hard drive used as main memory (RAM). Virtual memory is slower than main memory.
5. 8 bits.
7. An error which breaks the rules of the programming language and stops the code from running.
8. A network which covers a small geographic area such as single building.
9. A chip within the computer which controls the operation of all parts of the computer and decodes then executes program instructions.
10. A numbers sytem used by computers. It contains only two symbols.
14. The part of the CPU responsible for arithmetic and logical operations.