Hi.. I just bought this [500GB WD Elements Portable], http://www.wdc.com/en/products/products.aspx?id=480 Cover says, for using on MAC, we have to format it on MAC. So, I went to Disk Utility and erased the Drive using MAC OS JOURNALED and CASE SENSITIVE (Though I dont know the meaning). Then I was able to move files to it. But when Im connecting the same drive to my windows machine for copying files from it, windows doesnt even show this drive . Dont know, whats wrong. Im sure, its something with the formatting. Anyways, I need it to work on both windows and OS X. Whats the right way to use such portable hard drives for that reason ?