difference between mmc and SD memory cards?

[miri]

Does it matter what kind you use? Camera is a canon a510.

 

[Fritzo]

Always wondered myself. I know SD stuff can usually take MMC, but not the other way around.

 

[Dessert Tears]

Same form factor, one (I think SD, "secure") has extra "features." I believe the root cause for the 2 formats was licensing, not any real technological difference. I think relatively new devices treat them interchangeably, but read your specific manual.

 

[Qwest]

none of my devices take them interchangeably. it takes either one or the either.

 

[Dessert Tears]

I checked my device manuals:

• Philips Rush SA230 MP3 player: online ads, Philips product brief, Philips manual all refer to SD/MMC. Requires proprietary formatting for the device to read, the card is still readable in other devices. Only used SD.
• Dell Axim X3i PDA: online ads, reviews say SD/MMC; Dell manual only refers to SD. Only used SD.
• Cheap USB card reader has a SD/MMC slot.