hc stands for high capacity. so any card that is 4gb or bigger is sdhc or micro sdhc.

edit: forgot to mention that 16gb is the biggest supported.

 

microSDHC are just microSD that are more than 4GB. The Desire can handle up to a 32GB microSDHC card. Well if you have a higher speed transfer it's better since if you use your phone extensively, you'll have alot of data on your microSD card. Buy the memory that fits you. If you want a lot of music, you know you'll use the camera to take a lot of pictures, you'll save documents (words/excels/pdf) on the card then yes, it's better to have a bigger/faster memory card. Also with Apps2SD enabled in Android 2.2, you'll have the option to install your apps to the microSD card, which means you can have as much apps as the capacity of your microSD card. Hope that answers your question.

-Roze-

 

whoops. it is indeed 32gb support, my mistake. Those cards are very expensive though. Only currently available from Sandisk.

 

that's pretty much the sweet spot in microsd atm, 16gb. For the sake of completeness:

class refers to the the speed of the card with 6 being the fastest available (as far as I'm aware).

there is a new kind of memory coming called sdxc, which will have upto...I want to say 2.5 terrabytes, but it's at least 1tb. However, unless HTC are keeping a big secret, our devices will not support xc cards, plus, they are a bit hinky. Apparently, if you accidentally format an xc card in a hc drive, it'll never be xc again.

To make it worse, if you put an xc card in the hc slot of something like a camera, it will probably pop up a message telling you that the card needs to be formatted & would you like to do it now

 

That's WHY they are expensive

Just imagine when the SDXC comes out...2TB!!!! just imagine how much THAT baby will cost us Technologies never cease to amaze me!

Two Terabyte SD Cards Coming Soon | Gadget Lab | Wired.com

 

on the subject of memory cards i've got a sandisk 16gb sdhc unopened brand new( ordered two by mistake from vodafone) if anyone is interested pm me. looking

 

That link is for the m2 one as I'm selling two cards but het u can't blame me for trying to sell them