A user backs up files using data compression software.
Explain one benefit of using data compression software.
Mark scheme
Award up to two marks for a linked explanation such as:
- Files take up less storage space (1) because compression stores the data using fewer bits/removes redundant or unnecessary data (1)
- Files can be transferred/downloaded faster (1) because there is less data to send over a network (1)
- More files fit on a storage device (1) because each file is smaller (1)
- Email attachments can be sent without exceeding attachment size limits (1) because compression reduces the size of the file (1)
For both marks, the expansion must follow/associate with the statement.
Do not accept 'it makes files smaller' on its own without a named benefit such as using less storage space or faster transfer; this repeats the question.
Do not accept 'compression frees up space by deleting files' as compression does not delete the original file.
Do not accept answers about disk defragmentation as this is a different utility.
Example answers and how they were marked
Files take up less storage space because compression stores the data using fewer bits.
Why: Point (1) for less storage space and linked reason (1) because the data is stored using fewer bits.
Files take up less storage space.
Why: Point (1) for the benefit of less storage space; no linked reason.
It frees up space by deleting files that are not needed.
Why: Describes compression deleting files, which the mark scheme rejects; no credit.