Hi, I have an external drive which works fine with windows xp but cannot be read by the mac. I reinstalled the mac a couple of days ago because it was being very slow and I had a bunch of junk on it. Anyway, after that, it won't read the external drive. It will give me an error message saying that the disk is not readable by the computer. Sometimes it will give me the message saying that the drive was unmounted improperly by windows and for me to unmount it correctly. When I go back to windows, it's there, then I restart and go back to mac, it'll give me the message that the disk is not readable. I have 2 of these drives and both of them have this issue. I also tried disk warrior but it says that the file system cannot be rebuilt.