Hello, one of my external HDD:s has been acting funny lately; it will show up in Explorer, then disappear, then reappear after a short while with acompanying Autoplay dialog (as if it had just been plugged in). And so it goes. Is there some thorough diagnostics tool that will tell what's wrong or maybe lift the data from the disk then write it back or...I don't know. Please help before it craps out altogether! Thank you!