First, make sure that you have hfsprogs installed. Example installation >command:

    sudo apt-get install hfsprogs

    Next, mount or remount the HFS+ drive; commands need to be as follows:

    sudo mount -t hfsplus -o force,rw /dev/sdXY /media/mntpoint

    or

    sudo mount -t hfsplus -o remount,force,rw /mount/point ...

    Finally, if the drive was improperly unmounted or has otherwise become >partially corrupted run fsck.hfsplus ... as such:

    sudo fsck.hfsplus -f /dev/sdXY