The software I would need would be for windows to be able to write to the MAC partition.
Windows explorer can read the data on the MAC partition already.
I do mean time machine not timewarp.
Earlier mrmacfixit mentioned that creating a 3rd partition is fraught with danger but I have seen that other people have done it successfully.
I can back up both platforms so I won't run the risk of losing any data.
Wouldn't this be the most elegant solution?