Hi Kurt. Your patch appears to work on Mac OS X 10.5.7. Great! ~/code/bsd-port $ java MountTest FileStore: / (/dev/disk0s2) type: hfs isReadOnly: false total 243862672 used 212010248 avail 31596424 FileStore: /dev (devfs) type: devfs isReadOnly: false total 1 used 1 avail 0 FileStore: /dev (fdesc) type: fdesc isReadOnly: false total 1 used 1 avail 0 FileStore: /net (map -hosts) type: autofs isReadOnly: false total 0 used 0 avail 0 FileStore: /home (map auto_home) type: autofs isReadOnly: false total 0 used 0 avail 0 ~/code/bsd-port $ df -k Filesystem 1024-blocks Used Available Capacity Mounted on /dev/disk0s2 243862672 212010216 31596456 88% / devfs 107 107 0 100% /dev fdesc 1 1 0 100% /dev map -hosts 0 0 0 100% /net map auto_home 0 0 0 100% /home