Great site thanks guys. don't know if this is of use but here goes anyway. Purchased 500 gig internal laptop drive, fitted it inside a usb case, plugged it in, windows confirmed new hardware found etc, went to my computer, it wasn't there. Scratched head for a while, opened device manager which informed me the drive was working correctly, disabled and re enabled the drive, still not there. Brainwave : Opened EASEUS partition master, the drive was listed as disk 2, I partitioned and formatted it and gave it a drive letter. Went back to my computer and there it was. This saved me a trip to the computer shop and a bill.