MicroSDHC card with corrupted filesystem?

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Got A-Data 4gb card yesterday and it worked initially until it started to look strange when I was transferring big files unto it. Seems like I couldn't end the transfer and on it appeared a catalog named xxxxxxx.xxx. I disconneced tilt during this transfer and neither tilt no Dell 1420 with SDHC reader can see this card anymore. Nothing happens at all when I plug it in. I hoped that reformatting will work but Dell doesn't see card even in disk management tools (Vista). Regular size SDHC card is read by dell just fine.
Card hardware failure or filesystem problem? Thanks!

I have experienced this issue as well with both a 2GB and an 8 GB card. I have noticed the corruption mostly happens when I take the cards out to transfer big files using a USB reader. Do not touch the surfaces of the cards, handle them by the edges to minimize the risk of losing your data.

Thanks, I will remember that but if card is not seen as a drive by PC can I still return it to workable state?

You will likely have to format it with FAT32. Obviously your data will then be toast (but in all fairness it probably already is). If you can't format it then you need to google for memory card data rescue utilities. If none of these suggestions pan out, I would start the warranty procedures with the manufacturer to get it replaced.

Hope this helps!