R4 SDHC recognizes sandisk micro SD but doesn't recognize knigston micro SD
I've bought a few R4's which run on the firmware from r4sdhc.com. They work fine with sandisk micro SD but they don't recognize kingston micro SD, weird. The kingston's work fine in R4i red box flashcards. I even tried formatting the kingston micro SD with panasonics sd formatter tool, still no joy. I have a fair bit of experience with flashcards but I've never come across anything like this.
One other thing i thought was unusual was that the data transfer rate on the kingstons I have is very slow, about 2 or 3 mins for 20mb when it's about 20 seconds for the sandisk.
I have tried 4 kingston micro SD's 2GB and 4GB and they are all brand new.
Has anybody any idea why this is happening and if there is a fix