How To Wipe Macbook Hard Drive. To get started click the Disk Utility option. Select the local drive.

Insert the Redkey USB into a free. By the lower right side of the screen click Erase. Go to Security Options by the lower part of the screen.
If your Mac uses HFS be sure to choose Mac OS Extended Journaled from the list of formats.
Its not so hard if you follow these steps. If your Mac is not using an SSD you can erase your hard drive by following the steps below. Launch the software and you will see a simple interface like below you are able to check Status Cleaner and Toolkit in the main interface. When youre ready click the Erase button.

