I think one of my 2gb SDs is corrupted.

I've tried file transfers from my laptop to my N800. I used the PC's "Stop" process on the USB's "mass storage" (N800) drive and it tells me it is OK to disconnect the USB device. But the N800 gave a corrupted memory card message when I unplug it.

Should I have to wait longer for the N800 to somehow disconnect itself?

Now the card (1 of two 2gb cards) flakes out when I try to access it, causes the N800 to dim out/shut off and necessitating it's removal and re-inserting the battery. The PC won't recognize tme SD when I try to access it via a separate USB card reader.