So, i'll try to be as detailed as possible. I have been using a Seagate FreeAgent Go 500GB portable hard drive (reformatted to HFS+) with my 13" Macbook Pro for a while now. I use my computer to rip my DVDs and put them on the hard drive to play on my Xbox 360. Things were working great until it stopped mounting on my Macbook (or any other computer running OS X). The strange part is that it is still recognized in disk utility, but when i try to "mount" it it says something to the effect of "an error has occurred, try repairing the disk". However, when i attempt to repair the disk it says that it is fine. Also, i have tried to use an external power source so power is not the issue. In fact, it still works and plays the movies when connected to my Xbox 360. I would like to get my computer to recognize it again so that i can continue adding movies to the hard drive. Any help at all is greatly appreciated.