Hello, experiencing an irritating problem with one of my external hard drives. It's just a generic, "Rock Mobile Disk", 750GB external that I have been using for not-so-important files to use between my Macbook Pro and XP through Bootcamp. Usually all that it takes to read and write from both sides is to properly eject the drive in each platform. For some reason, suddenly I am not able to write to the drive from the Mac side. Is there something I am doing wrong? Thank you..