Hi I have set up a USB disk on my airport extreme. I can access this disk from both mac and windows (via airdisk utility). My problem is when the disk is connected to windows XP and written to, the disk becomes unavailable on my mac. When rebooting my mac, the disk now pops up as a PC server. I can´t connect to it. When rebooting the airport, I can access the disk again. How can I prevent this from happening?