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Flash Memory Flash memory is a chip of memory that retains information without having a charge applied to it. It's the most common type of memory that is being used on and with modern computing systems. It's very similar to SSDs in that is has no moving parts and is also hot swappable. SD Cards, which are used for smaller devices like cameras & cell phones, and USB devices are excellent example of Flash Memory Devices. We'll define the term "Compact Flash" and diagram how it works, as well as explore how SD Cards and other devices use flash memory and retain their data.