A problem was discovered in the way the MacOS version of "mkfs" defines a 
NetBSD Partition. This only happened when a partition was converted into 
a NetBSD partition, or a NetBSD partition was converted into a different 
type of NetBSD partition.  The new version of mkfs (v1.3) was moved up to 
the ftp.netbsd.org server and it should fix this problem. Also it's now 
possible to convert any existing HFS, AU/X or NetBSD partition into 
"Root", "Usr", "Root&Usr", or "Swap" NetBSD Partitions.

-bob