What file system did you format to? From within Windows, you should be able to access the drive, and reformat it. Reformat to NTFS, and make sure there are no partitions...

Other than that, some motherboards can only use a maximum of xxxgb on a slave drive, so this might be the prob? I dunno too much about that tho....

Give the reformat a try. Should just be able to right click that drive and select FORMAT from the drop menu....