Hi All, I run a MacBook Pro Mavericks while my wife uses a Toshiba Win 7 laptop. She has just bought a new Toshiba external 1TB drive and wants to share some files with me (scanned photos). However I can only read from this HD, not write to it. Is there a compatible files system we can format the external drive, (not Fat32 as photo are too big) so we can both read and write to it? Any advice would be appreciated.