SD Card Secure Digital memory cards are derived from MultiMediaCard.
[more]Continued from above. They differ from MMC in that SD Card Secure Digital cards include a high performance nine pin serial interface. SD Cards also feature a write protect switch. SD Card Secure Digital memory cards made improvements in electrostatic discharge tolerances add increased data protection over early generation MMC. SD Cards are ideal in small form factor, low power applications. SD Card Secure Digital memory include a proprietary cryptographic security scheme for copyright enforcement, which entities with DRM interests consider a 'feature.' SDHC are SD Card Secure Digital Memory Cards formated as FAT-32 (>2GB). SD Card 2.0 devices are capable of minimum sustained read/writes depending on their class rating. More compact versions of SD Card include miniSD and microSD (aka TransFlash).
