The Amiga's RDB can live anywhere in the first 16 blocks of the HDD. So if your Amiga partitioning software wrote the RDB to a later place, it hasn't been overwritten by the PC's MBR which always resides in block 0.
When formatting with NTFS you probably did a quick format which only writes a new directory and does not wipe all data on the HDD. Additionally the Amiga's FFS starts creating files in the middle of the partition while NTFS starts at the beginning.
All this means that both NTFS and FFS can coexist on the same HDD. However, some of your Amiga files probably got corrupted by the NTFS attempt.
I wonder why you did this disk management / NTFS thing at all when you want to use the HDD for the Amiga. It's the most stupid thing to do IMHO. WinUAE will refuse to use the HDD if there are PC partitions on it.
Bye,
Thomas
