MMC vs SD Card: Key Differences & Which One to Choose
MultiMediaCard (MMC) is the original flash memory card format; Secure Digital (SD) is its faster, feature-rich successor with a write-protect switch.
Shoppers grab the cheapest card that fits the slot, but an MMC label hides inside many adapters and drones, causing “SD” to be misremembered when it’s actually the older sibling.
Key Differences
SD adds a lock tab, 4-bit bus, DRM, and higher speed classes; MMC lacks these but is slightly smaller and draws less power. Most devices accept only SD now.
Which One Should You Choose?
Choose SD for cameras, drones, and phones; its speed and compatibility future-proof your media. Keep MMC only for legacy industrial gear or tight-budget embedded boards.
Can an MMC slot read SD?
No; the extra pins and thicker SD card won’t fit or function.
Is microSD the same as SD?
microSD is a smaller form factor of SD, not MMC.