That settles it. The Class 2 symbol is definitely on a different part of the card than the Nextweb cards that we bought. This is what the SanDisk website also showed. I'm glad I sent mine in. Last thing I need is for it to fail - and fake cards fail. It's not because they're fake necessarily, and may not have anything to do with the manufacturing quality - the biggest problem is that only two manufacturers in the world make 4GB cards: SanDisk, and Toshiba (as far as I know.) This means that any fake 4GB cards are smaller cards that are rebadged and fudged with until their FAT32 headers read 4GB. This explains to me why my Tablet couldn't read it (had no problem with the 512MB card) - since Windows XP probably performs a few more consistency checks when mounting a volume.