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DAVJ277 1.2.2

J277 GCSE CS 1.2.2 Secondary Storage

QuestionAnswer
Secondary storage—What is it and why do we need it? Long term/non-volatile storage of data and files We use it for the permanent/semi-permanent storage of files. Secondary storage is needed to store the operating system (and other applications and files) even when the system is switched off.
Secondary storage technologies—What are the three types? Optical Magnetic Solid state
What are the characteristics of different types of secondary storage that you need to consider for suitability? Capacity Speed Portability Durability Reliability Cost
How many 4MB pictures can be stored on a 16GB memory stick? 16,000,000,000 divided by 4,000,000 = 4,000 pictures.
How much capacity would be required to store a 5,000 character word processed document using ASCII? 5,000 bytes (1 byte per character) or 5 kilobytes
Why does a digital camera need secondary storage? For long term/non-volatile storage/store photos when device is turned off To store photos EXAM TIP! Refer to context of question
Optical storage—give examples of devices that use this and characteristics CD/R, CD/RW, DVD/R, DVD/RW Use: music, films and archive files. Low capacity. Slow access speed. High portability. Prone to scratches. Low cost—suitable if multiple copies needed.
Magnetic storage—give examples of devices that use this and characteristics Eg. Hard disk drive. High capacity for low cost. Medium data access speed. Low portability (moving parts). Reliable but not durable . Medium cost.
Solid state storage—give examples of devices that use this and characteristics Memory cards & solid state hard drive (SSD). Use: digital cameras and smartphones—any portable device Medium capacity. High portability. Reliable and durable. No moving parts. Fast data access speed. High cost.
Secondary storage technology most suitable for: 1. Skiing headcam 2. Video library 3. Free gift for a magazine 4. Portable games console 5. Engine management system Skiing headcame - Solid state: durable, no moving parts medium capacity (or high but expensive). Video library - Magnetic: high capacity relatively cheap. Free gift for magazine - Optical: low cost for multiple copies. Portable games console - Solid state: medium capacity, portable. Engine managment system - Solid state: durable. fast. no moving parts
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