SD memory card

(Secure Digital Memory Card) A flash memory card that provides storage for digital cameras, cellphones and PDAs. SD Memory Cards use the same 32x24mm form factor as the MultiMediaCard (MMC), but are slightly thicker (2.1mm vs. 1.4mm), and SD Card readers accept both formats. Introduced in 1999 by Panasonic, Toshiba and SanDisk, cards up to 2GB are available.

Learn also: Raspberry Pi Backup SD Card.



Learn more:

  • RS-MMC
    "MMC cards also come in a smaller form factor, of about half the size: 24mm x 16mm x 1.5mm. This alternate form factor is known as Reduced-Size Multi-Media…"
  • Optical Disc
    "An optical disc is a storage medium from which data is read and to which it is written by lasers. Optical discs can store much more data -- up to 6 gigabytes…"
  • Compact Flash Card Definition and Using
    "Compact Flash (also CF, CompactFlash) is a solid-state flash memory card unit, somewhat bulkier but sturdier than more popular Secure Digital (SD) cards.…"


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