PBHGetVInfo with 4GB volume

[chuey@rstar.com (Paulus Chu)]

I can get the total number of free blocks and block size from PBHGetVInfo.  It
works fine
until I use system 7.5.1 on the PowerPC with 4GB volume.  It returns 2GB as
total size.
The Finder tells me 1GB is used and 3GB is available while PBHGetVInfo tells me
0 byte is
used and 2GB is available.  Where does the Finder get the volume info?  Is there
some other
traps I should use?  Or is there some new system calls from system 7.5??

Anyone has experience with 4GB volume?  Please help.  Thanks.

- Chuey -