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Recap … , /output devices and memory

We know a is any electronic device that processes data. There are many different types of computers: ● general purpose systems (desktop and portable PCs, smartphones), ● dedicated systems (eg traffic lights) ● control systems (eg. security alarm) ● embedded (eg. inside washing machines) ● supercomputers (eg. for scientific research - weather forecasting).

We know computer systems are broken up into four sections: ● Input - raw data (eg. number or letters) goes into the system ● Processing - the data is ‘handled’ (eg. calculated, formatted, etc) ● Storage - data and information is stored ● Output - information comes out of the system and is shared with the users Recap … computers, input/output devices and memory We know data is INPUT using manual or automatic input devices, such as mice, keyboards, , scanners, cameras and sensors.

We know data is OUTPUT to users via output devices, such as monitors, projectors, speakers, headphones, printers and actuators/motors. Recap … computers, input/output devices and memory We know memory is used to store data that the (CPU) needs to access plus the instructions of running programs.

We know there are two types of memory RAM and ROM; RAM is volatile and needs constant power to store data. ROM does not. It is non-volatile. Let’s check what you know …. True or False?

1. Output shares data/information with a user? 2. A buzzer is an input device? 3. A smartwatch can have an embedded computer? 4. ROM is volatile memory? 5. A desktop PC is a general purpose computer? 6. A smartphone is a supercomputer? 7. Processing is done by the CPU? 8. An input device takes data out of a computer system? 9. A mouse is an input device? 10. A fingerprint scanner is an input device? 11. A fire alarm is an example of a control system? 12. RAM needs constant power to store data? 13. Sensors are output devices? 14. All computer systems can be broken down into 4 main parts? 15. Processing is the computer handling the data and instructions? Storage

Now we will look at ‘storage’. A storage device is a piece of computer equipment which can be used to store data. Examples include , DVD drive, USB stick.

There are lots of things you might want to store permanently on your computer such as documents and apps.

There are two main tiers of storage. These are primary and secondary: ● Primary storage is the internal memory that the CPU can access very quickly. ● Secondary storage is permanent, long-term storage. This type is non-volatile so it is kept even when the power is switched off. It is where apps, user files and software are stored when they are not in use. It is stored externally. Find out more ready for the questions on the next slide …

You can also use the internet to do some of your own research.

Here’s a video to explain ‘cloud storage’. Storage Questions

1. What is a HDD? 2. HDDs are fairly cheap to buy and have a long read/write life - True or False? 3. Give 3 facts about HDDs 4. What does the word ‘capacity’ mean? 5. What is a SSD? 6. SSDs are less likely to break if they get dropped or shaken - True or False? 7. Give 3 facts about SSDs 8. Name 3 types of optical disks 9. All optical disks are read only - True or False? 10. What is cloud storage? 11. A user needs an internet connection to access files - True or False? 12. Give one positive and one negative point for cloud storage Question-Time:

Sarah is deciding how she should store the photos she takes while on holiday.

Suggest one advantage and one disadvantage of using an external HDD instead of an external SSD.

One advantage of using an external HDD instead of One disadvantage of using an external HDD instead an external SSD is …. of an external SSD is ...