Computer Science › Section B · Data storage › Topic B.2
Main memory
Every running program and every piece of data it is working on sit in main memory, a huge, numbered row of storage cells. Knowing how those cells are organised, addressed and measured explains a lot about how computers behave, from start-up to slowdowns.
In this topic
- A reservoir of bits
- Cells, bytes and bit order
- Addresses
- Reading, writing and random access
- Worked example: counting addresses
- DRAM, SRAM and volatility
- Measuring capacity
- Worked example: storing a 16-bit value
- Caches and locality
- Worked example: the value of a cache
- Common mistakes to avoid
- Key takeaways
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