Thanks a lot for your help. I at least got the linux and the swapspace up and running again. But I completely bashed my FAT partition. Whe trying to fsck it, I get the error: Logical sector size is zero. The solution of copying sector 6 to sector 0 didn't work for me for I killed both with my dd command. Is there a way to recover the filesystem or at least some of the files (esp. the backupfiles)?

TIA