Seagate 6.0 st660211USB portable drive will flash a couple of times when connected (on several computers) but is not recognized as a removable drive, as in the past. Device Manager gives "This device cannot start" error. It went out all of a sudden and I didn't back recent files that I need to retreive. Have tried data recovery software, but the drive is not recognized to see files. I'm at a standstill other than sending it out for data recovery.