There's been a lot of posts about MMC Cards and all tthat stuff!
But I've got a question? What makes one MMC card work for instance on a 6600 an one doesn't work!!??
What are the differences?

Is the MMC formated? And if yes, it is formated using the FAT file system? If it has been formated with a card reader, it may have been formated using the FAT32 or NTFS file systems which are not accepted by Series 60 :)

That is not the point.Sinox is asking why some brands of MMC's with higher capacity then 128 MB are working and some are not.Not sure about this but i've read somewhere about a timeout for reading an MMC in Symbian OS so that higher speed MMC's have more chances of working.