Actually, fsck pointed out that the corrupted file in the filesystem was a backup file that I had recently created with the default backup application.

I ran fsck directly from a terminal on the device, I was not sure that I could do low-level operations through the USB-storage link.

I think that re-partitioning to ext2 would be a good idea... ext3 even better. Has anybody tried it? Is there ext3 support in the N810 kernel?