I just got two of these and was playing around with Xplorer360 and trying to copy the 120Gb contents to the 250GB and now one of the 250 Hitachi is not recognised by the Xbox360. In Computer Management it shows the Healthy Fat32 Primary Partition. In Horizon it shows all the original files. Xplorer360 does not read anymore. I don't care about the files on it I just want to restore for Xbox360 to recognise it. Any help would be appreciated, thanks.