If the drive is still functional enough to read/write, then running a utility like DBAN on it will completely ruin any and all traces of data on there. Trust me, there won't be a damn thing left to even attempt recovering.
That being said, you bought a drive, it failed. Return it and get another. If it is truly sensitive data that you absolutely can not have leave the premises and the drive is non-responsive, then suck up the loss, destroy the drive, and buy another.