Exam-style question
Try this first
Explain how an SSD stores data and why writing can involve block-level erasure.
Model answer
What a good answer should say
- An SSD uses NAND flash memory and a controller.
- The NAND flash memory is based on floating gate transistors that trap and store charge.
- Data is organised into pages, and many pages make up a block.
- A page cannot simply be overwritten.
Explanation
Why this works
The answer identifies the NAND flash memory, floating gate transistors and trapped charge, then explains the page-and-block structure. It also states the key writing rule: a page must be erased before writing, while the whole block must be erased.
Common mistake
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