Problem with using external drive in OSX

Hi there, I have an external hard drive (seagate freeagent 1TB) and I am using Mac OSX Snow Leopard and Windows XP as bootcamp. Yesterday it suddenly happens that I find the drive extremely slow or even unable to read files. It cannot be unmounted as well. I thought the drive has problem and tries to repair it, however when I use bootcamp XP today and mount the drive. It is fast as usual and don't have much problem. Why is this and should I reinstall my OSX to solve the problem? Well I hope I don't have to reinstall but if I have to, I probably will upgrade the system to Lion...

also sorry if this is a reposted question.....i tried to search around the discussions and couldn't find the answer to my specific situation....actually didn't even see anyone trying to do what i'm talkin about.......again thanks for any help

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