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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