Whoops! Performed a CLEAN on my 2tb External USB
By mistake I performed a CLEAN diskpart operation on my 2tb external usb hdd. After a couple of minutes of panic, I was able to rebuild the partition table with an excellent opensource tool TestDisk (http://www.cgsecurity.org/wiki/TestDisk). It was simple to use and located and re-built my partition table within seconds. /BG