Flash memory
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Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for
A disassembled USB flash drive in 2005. The chip on the left is flash memory. The Silicon Motion controller is on the right.
NOR flash by Intel
Serial Flash: Silicon Storage Tech SST25VF080B
An Intel mSATA SSD in 2020
SD card
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The SD card is a proprietary, non-volatile, flash memory card format developed by the SD Association. They come in three physical forms: the full-size SD, the smaller miniSD, and the smallest, microSD
Flash memory
…flash memory chips. The first NAND-based removable memory card format was SmartMedia, released in 1995. Many others followed, including MultiMediaCard, Secure Digital, Memory Stick, and xD-Picture Card. A new generation of memory card formats, including RS-MMC, miniSD and microSD, feature extremely small form factors…
This microSDHC card holds 8 billion bytes. Beneath it is a section of a magnetic-core memory (used until the 1970s) that holds eight bytes using 64 cores. The card covers approximately 20 bits (2+1⁄2 bytes).
Back side of a microSD card, showing its eight electrical contacts
Back side of a UHS-II microSD card, showing the additional row of contacts
Front and back of an SD Express card