Give one difference between RAM and flash memory - RAM is volatile and flash memory is non volatile, Give one example of a solid state device - SSD, flash drive, USB memory stick and SD card, Is a Solid State drive primary or secondary memory - Secondary, Why is a solid state device appropriate for a video camera - It's lightweight, portable and small in size making it easy to fit into a camera. There are no moving parts so it is durable., What's the purpose of virtual memory - Allows user to run programs when there is insufficient RAM. moves data not recently moved to the HDD to free up space in the RAM. , Why is it more beeficial to get more RAM rather than relying on virtual memory - More RAM will speed up access to the data. Excessive use can cause disk thrashing. VM is also more difficult to access than RAM., Describe the purpose of RAM - Stores the parts of the OS / programs that are currently running, Describe the purpose of ROM - Stores the BIOS/ Boot program. Used to start up the computer, What is virtual memory - A section of the hard disk which is used to store items in RAM which are currently not in use, Name a difference between RAM and ROM - RAM is volatile, and ROM is non volatile. Content of RAM can change but ROM does not, What is secondary storage - non volatile storage, Describe the characteristic of an optical secondary storage  - Cheap, lightweight, portable but can be easily scratched, Describe the characteristics of solid state secondary storage - Relatively expansive, no moving parts so not sensitive to movement, durable, less likely to be damaged and fast read/ write speed, Name three types of secondary storage - Magnetic, solid state and optical, Describe the characteristics of magnetic secondary storage - Large capacity, relatively cheap, sensitive to movement  due to moving parts, What features should be considered when choosing a secondary storage - capacity, speed, portability , durability, cost and reliability, Outline what happens when the computer converts the music into a file. - The height of the wave is measured/sampled (at regular intervals) and turned into binary, Kofi increases the sample rate his computer is using to record his guitar. Explain two effects this will have on Kofi’s recording. - The quality will improve and the size of the file will increase, Explain two reasons why using lossy compression is beneficial. - Lossy means the decompressed file is not identical to the original and the difference wont be noticeable , Convert the decimal number 191 into an 8 bit binary number. - 10111111, Convert the hexadecimal number 3E into a decimal number. - (3 * 16) + 14 =62, Explain the effect of performing a 2 place right shift on the binary number 11001011. - The number is divided by 4. The bits on the right are moved.,

Memory and Data Representation

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