![]() ![]() It writes two passes of random data to the volume or disk and then writes a single pass of a known data pattern to the volume or disk. Three-Pass: This is a DOE-compliant three-pass secure erase.Advanced recovery techniques could restore the data, but it would require a great deal of time and effort. Zero Out the Data: This erase method writes a single path of zeros to all locations on the selected volume or disk.It doesn't scramble the file data, which means a recovery app may be able to resurrect the erased data. Fastest: This is the quickest erase method.The drop-down Secure Erase Options menu presents options similar to the ones in earlier versions of the operating system, but it uses a slider for making choices instead of an options list. Options for OS X Lion Through OS X Yosemite Don't expect this erase method to finish any time soon. It writes over the data on a volume 35 times. 35-Pass Erase: This is the highest level of data erase security that Disk Utility supports.Department of Defense's 5220-22M standards for erasing magnetic media. 7-Pass Erase: This method meets the security requirements of the U.S. ![]() The length of time this method takes depends on the size of the volume. It erases the volume's data by writing over it with zeros. Zero Out Data: This method provides a good level of security. ![]() It removes the volume's catalog directory but leaves the actual data intact.
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