JdBP>> HPFS has "." and ".." entries in the root
directory.  FAT does not.

 FT> see HPFS "bug" in warp 4. this method is no longer reliable, [...]

I _know_ it's not reliable.  I was the one who originally brought up the
subject.  Did you not see my post in the OS2 echo on this subject a month
ago ?  Even prior to OS/2 Warp 4 it is not reliable.  As I hope you saw in
my original message I was trying to discourage its use as an "HPFS
detector", because it yields too many false positives with other
non-FAT filesystems on _any_ version of OS/2.

DosQueryFSInfo is obviously the _correct_ answer.  He cannot use that from
his DOS program of course.  But then again he should be writing OS/2
programs by now ... (-:

 ¯ JdeBP ®

--- FleetStreet 1.16 NR