![]() ![]() After you boot, launch Disk Utility, select the startup volume, and click the Erase tab. First, erase a drive without the overwriting part, and reinstall OS X. There’s a slightly different way to accomplish the same goal. You’ll save a little time if you do an erase without overwriting, then reinstall OS X, then Erase Free Space with an overwriting option. ![]() Select Disk Utility from the startup menu, and you can erase your startup drive securely. Restart a Mac and hold down Command-R after the startup chime sounds, and the computer boots into the recovery mode. Then you’d run Disk Utility to erase your startup drive. ![]() Securely erase your hard drive with Disk Utility.īefore Lion, you had to boot from a CD or DVD system disk or a third-party utility, like Disk Warrior, or from an external drive with OS X installed. Once is considered enough for regular purposes, while three and seven correspond to different U.S. When you select a volume in Disk Utility and then the Erase tab, you can click Security Options to pick how many times the drive is overwritten: once, three times, or seven times. That’s been built into Apple’s Disk Utility for years. To get rid of old data in a thorough fashion, you need use a multi-pass approach, in which every bit of storage in the disk is overwritten with new data (often zeroes). ![]()
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