if your hiding things from the government they'll probably find a way XD lol, format to 0's a few times, its said after 4 times of complete 0's theres nothing that can recover it

Well there are software which safely erase the files from the hard drive. They Wipe, Erase, Overwrite, Destroy, Eliminate Data and Files. Software like Stellar Wipe extremely powerful and effective data cleansing software. Software ensures complete data destruction by removing previously deleted files / folders. The file eraser utility also wipes free space (unused space) on the hard drive ensuring complete Data Destruction. The Data once erased using Stellar Wipe is beyond the recovery limit of any Software.