This 500gb drive in a Medion case has failed to get a drive letter in Win7 on HP Pavilion dv6 and manager says failed to initialise. I have seen the problem mentioned on sites but no solution. Hidden icons sees it for safe removal. Before I consider it dead, could it be related to a problem with my two Seagate 750GB Extension portable drives? These are commonly suddenly lost from sight during use, "lose" files (when I try to resave in Photoshop) which are still there and need shut down and re-start to keep going. I do not trust them. I cannot get to an answer on Seagate site. Can anyone help please?