Here is what I am trying to do. I have my external set for time machine backup. I have about 1.5TB of data on my HTPC windows drive I would like to back up on the external drive. How would I go about this? Is it even possible ... Is the only way to do it to reformat the external with 2 partitions and making one for mac and one for windows? Would my OSX computers be able to read from it? I would like to watch movies on my OSX stuff or transfer a few to my ipad for when I hit the road. Thoughts?