Easy2 marksStructured
AQA GCSE · Question 17.1 · Fundamentals of data representation
State two reasons why data are compressed.
State two reasons why data are compressed.
How to approach this question
Think about the two main things we do with files: store them and send them. How does making a file smaller benefit both of these activities?
Full Answer
1. **To reduce storage space requirements:** Compressed files take up less space on storage devices like hard drives and SSDs.
2. **To speed up data transmission:** Smaller files can be transferred over a network (like the internet) more quickly, reducing download/upload times and using less bandwidth.
Data compression is the process of encoding information using fewer bits than the original representation. There are two primary motivations for this:
1. **To Save Storage Space:** Compressed data occupies less physical space on storage media such as hard drives, solid-state drives, or cloud storage. This allows more data to be stored in the same amount of space, which can also lead to cost savings.
2. **To Increase Transmission Speed:** When data is sent over a network (for example, downloading a file, streaming a video, or loading a webpage), smaller file sizes mean less data needs to be transferred. This results in faster transmission speeds, reduced latency, and lower bandwidth consumption, which is particularly important for users with slow or metered internet connections.
Common mistakes
✗ Vague answers like "to make it smaller" without explaining the benefit of it being smaller.
✗ Stating a type of compression (e.g., "lossy") instead of a reason for compression.
✗ Confusing compression with encryption.
Practice the full AQA GCSE Computer Science Paper 2
46 questions · hints · full answers · grading
More questions from this exam
Q01.1Convert the binary number 11010100 into decimal.EasyQ01.2Convert the binary number 10111001 into hexadecimal. You should show your working.MediumQ01.3State the largest decimal number that can be represented using 6 bits.EasyQ02.1Add together the following three binary numbers and give your answer in binary.
00110110
1001...MediumQ02.2Apply a binary shift three places to the right on the bit pattern 10101000. Give the result using...Easy
Expert