I just got my first MBP, and found an old external disk I no longer use to setup Time Machine. This eHD was previously formatted as NTFS and had some files on it. I thought I'd connect it up to the MBP and it obviously won't be able to recognise it and ask me to format. To my supprise, it appeared on my desktop, and having double-clicked on it I actually saw the files. So I then dragged one of these files (pdf) onto the mac desktop, and it worked. Double-clicked on the file it opened I thought the two OS's don't play nicely together, and if you want to use both either format as FAT or use network shares. This is strange no? One thing I didn't try be formatting for Time Machine, was the ability to write back, anyone know about this?