I am using 500 gb external usb hard drive to store my data. I was encrypted that drive with bit locker feature. But two day ago I moved my data into the drive and safely removed drive from machine. But when I re connected it to any windows 7 machine. It is not asking password and drive shows empty space. I lossed all data. Please help me, I had stored all company data into the drive.

Hi, I suspect you take the wrong external harddrive, or it was formatted by some person by accident. If you have copied the date to it, it will not lost itself. And the device should be work because you can open it. Regards, Leo Huang Leo Huang TechNet Community Support