Why do People say some 4GB SD Cards dont work?

Some people say that 4gb sd cards dont work on R4's
Is this true?I have a Sandisk 4gb Micro SDHC Card will it work?

Depends which R4 you use. The original R4 won't work with SDHC, but the R4 SDHC will. I don't know about any of the other R4s though.

The original R4 does not support SDHC, only SD.When 4GB TransFlash (MicroSD/MicroSDHC) cards first came out, they were still SD. But then SDHC became the norm. It is cheaper and easier to create 4GB SDHC cards than it is to make 4GB SD cards. So these days it is nearly impossible to find 4GB MicroSD cards, they are all SDHC.4GB MicroSD cards that are SD do exist, but you will likely never find one.

If you have just the R4 original or V2 you have to use a 4GB non SDHC for it to work

i got the newest R4i that DealExtreme has, it says SDHC on the title you think it will work?

Yes, SDHC cards will work with that.