when I connect my Seagate 1 TB external hard drive .it shows external hdd as Local disk D. but i can't open.it is still loading.. when i try to format using diskpart command,the command was not executing..i also checked disk management but it didnt load .....if i use any hard drive relating tool,it doesn't start..if i remove that drive ,all the process said above are running properly.pls help me to format or recover my Seagate external hdd