Okay, my brother has a Windows XP box, and I can sucessfully access it with smbclient and through mount -t smbfs. What worries me though, is his computer is NTFS format, and I don't have NTFS writing capabilities. Can I still write to the mounted drive, or will it corrupt? What about doing the same to an OS X samba share?

If you are going through Samba and the network, you can send anything over you want...

Your Linux box isn't actually writing to the NTFS partition. It's sending the files to the Windows box, and Windows is writing to the NTFS partition.

Same thing with OS X, or any other operating system. If the hard-drive is in another computer and being controlled by that other computer's OS, it doesn't matter what filesystem is on it.

My analogy is... I can't read or write Swahili. But, if I can find a guy who can, I can tell him what to write down, and he can read it back to me.

Thanks!