After monitoring this forum for a while it seems to me the best way to use LR on 2 computers is by putting the catalog and photos on an external HD and simply plugging it into which ever computer is in use. But how does this work across platforms, i.e. Win 7 and OSX. Specifically are there problems with read/write on a FAT32 formatted HD, problems with different naming conventions on the platforms for the HDs, or sharing preferences and presets. Would appreciate any advice, warning, or other comments from users who have, or are doing this. Or can it be done at all?