What is the difference between SD and Multimedia Cards for a digital camera?

[NUNCA]

I'm looking to upgrade my ram in my new canon powershot a510 digital camera to 512 memory. It works with SD memory and Multimedia Cards. Is their much of a difference between the two in performance? Are their any brands that I should stay away from?
These are the cards I've been looking at:

Transcend 512MB MultiMedia (MMC) Card Model TS512MMC - Retail
KINGMAX 512MB MultiMedia (MMC) Card Model MMC-512M3 - OEM
Edge Tech 512MB Secure Digital (SD) Card Model PE189419 - Retail
Rosewill 512MB Secure Digital (SD) Card Model RSD512 - Retail

 

[Kevlarman]

SD cards are faster, and IMO, more mainstream.

Get the SD.

 

[SidewinderX]

fast, reliable flash memory is a worthy investment. Look for kingston, sandisc, and lexar. Preferably thier professional lines.

 

[Trikzy]

you can also encrypt info on an sd card, well according to maximum pc.

 

[Stereodude]

fast, reliable flash memory is a worthy investment.

Considering it gets cheaper every month I wouldn't go so far as to consider it an investment.

 

[Tim_axe]

Considering it gets cheaper every month I wouldn't go so far as to consider it an investment.

I too wouldn't consider it an investment in that you could resell the flash memory. It does get cheaper so this doesn't work out.


But I would definately consider it an investment in that I rely on it to keep my pictures safe.

So I'd definately buy the products from reliable/established companies. I would also purchase products from their higher product tiers, ie the professional/high-speed stuff. Just a small monetary investment to know I am getting some better hardware in my cards to help protect my images.