Hi, I formatted all my backup drives using ExFat format for a Mac running 10.7.3 and a PC running Windows 7 64-bit. I am interested in getting a two-drive RAID 1 setup (from OWC or G-Tech) and wondering if I can format the drives as ExFAT. So far the ExFat drives have allowed me to move data from both laptops to the drives. Is this a wise move or are there any unforseen dangers using ExFat formatted drives with both systems. Guy at computer store said bad to use ExFat and I should just format each drive for each system. Thanks. Thanks.