1.3 Storage Flashcards Preview

GCSE OCR Computer Science > 1.3 Storage > Flashcards

Flashcards in 1.3 Storage Deck (7)
Loading flashcards...
1
Q

What is secondary storage?

A

Storage location which permanently stores OS, programs and data.

2
Q

What is the purpose of secondary storage?

A

To use the data later.
To use the software.
To interact with the computer.

3
Q

How do optical drives work?

A

A laser light marks patterns into the disk which represent 0’s and 1’s.
Then the laser light detects where the marks are and translates them into a readable format.

4
Q

How do magnetic drives work?

A

They read / write across the medium and change how magnetised that part of the medium is.
Each level of magnetism represents 0’s and 1’s.

5
Q

What are the properties (made up of and characteristics) of solid state/flash drives?

A

They are made up of silicon microchips (switches).
They are fast but the most expensive and have no moving parts.
On = 1.
Off = 0.

6
Q

How much data does one character represent?

A

1 byte per character.

7
Q

What percentage overheads do you need when calculating data?

A

10%.

But only use if the question specifies.