Hi, I have external HD with data in it and was using with Windows Machine and I will not be using this with Windows any more because my windows died while ago. I would like to use this HD for time machine with my MBP, to do that I need to farmat HD to comply HFS+ file system format and to do that I need to copy all data over to Mac from HD and then I can use it for time machine. But I do not want to store data on to Mac since it is lot of data I dumped on to Mac from HD, Can I copy data back to HD and then use it for time machine ?? for my current data on Mac so that I end up retaining data as it is on HD and also can use for back for Mac. Please advice. Thanks.