This deep dive covers Deep Dive: Why Do We Need Secondary Storage? within Secondary Storage for GCSE Computer Science. Revise Secondary Storage in 3.4 Computer Systems for GCSE Computer Science with 17 exam-style questions and 18 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 3 of 11 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Deep Dive: Why Do We Need Secondary Storage?
Remember that RAM is volatile - it loses everything when you turn off the computer. Imagine if every time you shut down, all your photos, documents, games, and the operating system itself vanished! That's why we need secondary storage - non-volatile memory that keeps data permanently, even without power.
Secondary storage is any non-volatile storage device that stores data long-term. Unlike primary memory (RAM), secondary storage is:
- Non-volatile: Keeps data when power is off
- High capacity: Stores hundreds of GB to many TB
- Slower: Much slower than RAM but that's acceptable for long-term storage
- Permanent: Data stays until deliberately deleted
Practice questions for Secondary Storage
Which of the following is a characteristic of secondary storage?
Describe how data is stored on a magnetic hard disk drive (HDD).