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SSDs are separated into two broad categories: volatile DRAM-based and nonvolatile flash-based. Flash-based SSDs made with NAND memory (a transistor-based gate that has the opposite output to an AND gate) use considerably less power than HDDs

From

Cover of CompTIA® A+® Complete Deluxe Study Guide: Exams 220-901 and 220-902, 3rd Edition

Note

Hard disk drives (HDDs) are primarily found in computers and laptops. Solid state drives (SSDs) are becoming more common in computers and laptops, and are also found in tablets, cell phones, portable drives and mp3 players