mycomputer

Hi, guys. I've a 500GB Maxtor external drive. I've formatted from command prompt, using "Format" command. Then again formatted it by right clicking on its icon in MyComputer. After doing all these, how do I ensure that its content can't be recovered?

my friend tried to open a .lnk file with IE and now none of the shortcuts on his desktops are working(except Mycomputer) , all the icons have changed....pls help.