Referring to your msg of 06 Mar 1997:

 RF>  I'm making a DOS program that will run under DOS and OS/2.
 RF>  The only problem I have is that the information about the
 RF>  cluster size of a HPFS partition always comes wrong... 

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

 JdBP> This is not foolproof, because other filesystems, such as LAN
 JdBP> Server and CDFS, also have such entries.  Basically this is a FAT
 JdBP> detection method, rather than an HPFS detection method.

Another (maybe also not foolproof) check: read from the partition boot
sector the field "number of copies of the FAT" (unsigned byte at
offset 16). Not surprisingly this is zero on HPFS volumes. 

Cheers, Rob 
--- timEd/2 1.10+