My External hard drive keeps ejecting randomly in Snow Leopard. How do I stop this, and prevent it from happening?

I'm currently running a clean install of Snow Leopard version 10.6.8, and I have done nothing but attempt to mount my external hard drive, which is a Fantom 2 TB Greendrive connected via eSATA through an ExpressCard.
It performed flawlessly in Leopard, and I had no issues with it whatsoever. Then, I performed a clean install of Snow Leopard (erased the drive, and installed via DVD), and when everything had finished, I brought up a finder window, mounted my External Hard drive, and attempted to drag a folder to the desktop. It got to about 15%, and froze. Then, a few seconds later, it told me that I had removed it without ejecting it safely.
It continues to do this every time I try to move a large file to my cleanly installed internal hard drive. It varies on the amount of time it takes to 'eject'. Sometimes the file will get almost halfway there, and then the progress freezes, the 'eject' error is thrown, and my drive dismounts.
The file is about 6.2 GB, and it's vitally important to my livelihood to get this drive working reliably. (It contains CS5 (legitimate copy), as well as extremely important personal files, and i'm a freelance Web Designer and Developer, as well as writer and blogger.)
Short Version:
OS: 10.6.8 (Snow Leopard, clean install)
External: 2TB Fantom Greendrive (eSATA through ExpressCard)
Issue: Randomly ejects drive while transferring larger files.
Any help would be greatly appreciated! Thanks so much!
Taylor Daughtry

I have the same issues, The drivers are not great for eSATA right now. I think apple is puting all there effort into Thunderbolt. Ther should be a Thunderbolt to eSATA adaptor soon, untiull then you might want to get a firewire enclosure for you drive as I have had to do.
Maybe you can blog about my app? www.BeautifulClockRadio.com
Mark

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