GoFlex drive disconnects randomly after ML install

After installing ML, my 1 TB GoFlex, drive connected via Firewire 800, disconnects randomly and gives me the "The disk was not ejected properly..." error. Then it reconnects immediately. It does this a lot and, like I said, randomly. Has anyone else experienced this problem with an external drive?

Yes, I can't get any external drive (formatted in exFat and over 1TB) to come after installing Mountain Lion. My smaller drives like 250GB etc work fine but anything 1TB or over gets disconnected constantly or doesn't come up at all. I have tried to verify the disk and repair the disk in disk utility but it says it cannot be repaired. But the drive works fine on my Lion laptop..eh

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