![]() ![]() It handles reading and writing, voltage regulation, and other tasks including error correction and bad sector management. This controller is essentially a small computer that acts as the interface between the flash memory and the host device (camera or card reader). The second component of a memory card is the controller. A cell may contain either a charge or no charge ("0" or "1") in single-level type memory, or in multi-level cell type memory a specific charge level may be stored. NAND flash memory stores information in individual cells by setting an electrical charge. The memory in these cards is the NAND (Negated AND) type that is written and read in blocks rather than single bits at a time. Flash memory is non-volatile meaning it retains data without external power. ![]() Secure Digital (SD) and CompactFlash (CF) cards consist of flash memory and a controller. ![]() Memory Card FAQ What is inside a memory card?
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