This is a replacement UHPFS.DLL that fixes a Warp 4 HPFS problem where it
reports a 'MINOR SYSTEM ERROR' back.

The PROBLEM DETAILS:

The "minor" filesystem error reported (but not repaired) by CHKDSK is a
result of some last minute changes in Warp 4.  In case you didn't know, FAT
directories always display a "." and ".." entry when you do a DIR.  The
exception is the root directory.  HPFS doesn't use "." and ".." entries,
but it does have a special "start" entry.  For FAT compatibility, any time
the "start" entry is processed, HPFS gives back a dummy "." and ".." so
FAT-only programs will be happy.

Here's the problem - even the ROOT directory has a "start" entry.  That
means you'll see a "." and ".." dummy when you do a dir on an HPFS root
directory.  That didn't seem to hurt anyone, but it wasn't completely
compatible.  The "fix" was to put a HIDDEN flag on the "start" entry of the
ROOT directory.  This keeps the "." and ".." from appearing unless you do a
DIR /A (better than the old way) and you then are compatible with FAT
drives.

Now, enter the shipped HPFS CHKDSK.  No one told it that it was OK to have a
HIDDEN attribute on the "start" entry.  CHKDSK complains, tries to fix it, and
fails.  That's where the "minor filesystem error" message comes from.

This APAR fixes UHPFS.DLL with a code change that ignores the
HIDDEN attribute on the "start" entry.  If you use it, you won't see the
"minor filesystem" error anymore, but NO CHANGE IS MADE TO ANYTHING ON THE
DISK.  In other words, the message reported by the shipped CHKDSK doesn't cause
any trouble, but this will fix it. The message could be annoying and it
leads one to beleive that the HPFS drive is experiencing problems when it
isn't. This APAR will also be included in the first FixPak for Warp 4.

How to Install:

You must boot your INSTALL DISKETTES and use F3 to get to a command prompt.
Then you copy the enclosed DLL into the OS2\DLL directory of the BOOT
drive. It is suggested that you save the old UHPFS.DLL for safety, but if
you should desire to put the old one back, it can also be retrieved from
the product CD.

OS/2 Support