Yes, i ve tried all of the possible usb connection combinations with all of other usb devices and plugged it alone, nothing happened. and also i didnt find free or trial version of Spinrite. and i tried some other software to find a trace of a file, absolutely no sign of a file exists in it, very spooky. So its all gone. and im afraid of my other 4Tb HDDs, if it happens again this will be a catastrophic situation. I want take measurements so any suggestions? Thank you.