More than once, when I had a Lenovo ThinkPad that needed depot service for a hardware fault, Lenovo has told me to remove the HD and keep it; at the depot they insert a temporary freshly-imaged HD, complete the repair and battery of tests, and send the ThinkPad back to me empty, for me to replace my own HD. (If I were still to have a problem, then I could complete the repair myself by replacing the HD.) This has always worked flawlessly.