Yes, the other card (2Gb usual SD) works about 4 days in idle/offline.

So I need some information from A-Data users to decide wether the card was incorrectly formatted and works wrong or it's broken in hardware and I must forget about it. (unfortunately I can't return it to the supplier)

houman, can you check how long the 'df' command in Xterm works with your card mounted? Do you have a standard kernel or modified one from Fanoush?

Do the Panasonic SD formatter perform 'full device erase' or something like that with 16Gb A-Data? I can't remember exactly the words, but mine says that the device doesn't support 'full erase' (or something like that).

Maybe It was wrong card reader? (Kingston FCR-ML)
Or SD clock in N800 too high?
I don't know what else to suppose...

Anyway, thanks for any information.