I killed my 1TB external hard drive by accident. It is a 9SF2A4-500 - Seagate Expansion 1TB USB 2.0 3.5-inch External Hard Drive. I was doing low level formatting (old school) i.e; writing random 0,1 in one pass when suddenly I got BSOD and computer started rebooting. But since then HDD is ruined, Diskimage does not detect it. Disk management detects it but can not perform any job on it. One time I was able to format it using AOMEI Partition Assistant 6. The job was done fine but computer still does not recognize it. When I plug in, it just spins and spins and spins . . . . . . and no sound from it. So for I have tried EaseUS Partition Master 9, MiniTool-Partition-Wizard-Pro-9.1, Paragon-Partition-Manager-Home-15 but all in vain. I appreciate any help.