@Wayne
> AmigaOS has code to thrash rdb's
No it does not.
AmigaOS contain code to write RDB to disk. This code is inside HDToolBox and is only triggered after you click Save and click Ok to some "Are you sure?" -requester.
This code does not trash RDB. And no, format command does not trash RDB either. Low level format is ignored by modern drives, too.
The routine inside Elbox drivers, if triggered, located and delirebately trashed RDB of the system disk.