i was just reading about data forks and the article made it seem that they only pertain to how its stored on the drive, but a mac friend told me that if you transfer a mac file to a pc and then back, it wont always work again.
i'm not really all that sure.
What happens is Macs store data about the file (icon, program creator, time stamps, etc) in a seperate stream in the filesystem from the file data so it sticks with the file no matter what. When you copy a Mac file to an NTFS partition if you're using Mac file sharing that file info stream gets copied too, to another file stream in a very similar way to how Macs store it. If you copy the file back using SMB or somet other non-Mac method you lose the file info, if you use Mac sharing you should be fine.