Okey doke, not a smooth move by unplugging it whilst it was doing bits and bobs. But all is not lost....yet anyway.
First and foremost I am guessing that this pocket HDD is USB controlled. Does the system make any noise when connecting the drive up? Have you checked Administrative Tools > Computer Management > Disk Management under the Control panel?
It could very well be that the partition has popped its clogs, so may very well need a reformat if it appears as Unrecognised
Urban Kaos
January 2008