Typically, deleting data on a computer is essentially just deleting the path to the stored data, not completely removing all stored information. Before selling old computers or replacing new hard drives, it is necessary to secure important and personal information, data, users need to delete their own data from the drive, or simply need a completely clean hard drive, using some freeware or even some default utilities built into Windows.
Wipe a hard drive to prevent data recovery from that hard drive. This process involves not only reformatting the hard drive, but writing new data onto existing data. There are many ways to wipe an internal or external hard drive for Windows and the following are the simplest but most effective methods. Before you proceed, make sure that your computer or laptop is maintained with constant power, otherwise it may cause the hard drive to fail or completely corrupt while the computer is carrying out data erasing.
Windows also has many special applications and freeware programs to safely delete the hard drive. For example, the Active Kill Disk program is a completely free, simple program for erasing data from a drive. Or you can use DBAN also completely free. The illustration below will use Active Kill Disk to do this.
After installing Active Kill Disk, go to Start> All Programs> Active KillDisk> KillDisk for Windows. A compact and very simple interface displays, and you only need to select the hard drive (internal or external) that you want to delete located on the left side of the screen.
When a drive is selected, the Kill button above will work. Click the Kill button. Now the Kill form appears, allowing you to select options for erasing the drive, then click the Start button. Note that you can also choose a pass method in the form of a pass.
Now, all you have to do is wait for the disk to format. After success, the drive is now completely clean like a new hard drive and there is no data when using programs to try to recover data.