I have a verbatim HM321HI external harddrive. I bough it used 3 years ago. I was adding more photos to it when conputr froze. I turned off computer and turned it back on. Now conputer doesnt find the drive. Its not in disk mangement either. I have tried other computers and boot menu in bios. Not there either. Hate to say it but i did open the drive not in a clean room to find the arm was not stuck. Now it runs for 30 seconds and shuts off. What i find weird is computer will always show icon for safe to remove device (mass storage). What should i do i need my data off it.