I am currently in the market for a portable external hard drive or enclosure with usb2+fw800. (Any recommendations BTW?) Is there any time of performance decrease in reading/writing onto the drive if its formated as NFTS and then use NTFS-3G on my Mac? Compared to HFS+ which is Mac's native partition. My main issue is wanting this external drive to be compatible between my Mac and Windows machines. Also want to run Time Machine backups on the drive, I know Fat32 would be another option, but not when it comes to large ISOs and 1080p videos larger than 4GB.