Disk Utility Mac
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. Don’t Erase Data — This method is quick, but not secure. It removes the volume's catalog directory but leaves the actual data intact. Zero Out Data — This method provides a good level of security. It erases the volume's data by writing over it with zeros. The length of time this method takes depends on the size of the volume.
Mac Disk Utility Erase Options
7-Pass Erase — This method meets the security requirements of the standards for erasing magnetic media. This erase method can take a long time. 35-Pass Erase — This is the highest level of data erase security that Disk Utility supports. It writes over the data on a volume 35 times. Don't expect this erase method to finish any time soon. Fastest — This is the quickest erase method. It doesn't scramble the file data, which means a recovery app may be able to resurrect the erased data.
Zero Out the Data — This erase method writes a single path of zeros to all locations on the selected volume or disk. Advanced recovery techniques could restore the data, but it would require a great deal of time and effort. Three-Pass — This is a DOE-compliant three-pass secure erase.
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. Most Secure — This method of securely erasing a volume or disk meets the requirements of the U.S. Department of Defense (DOD) 5220-22M standard for securely erasing magnetic media. The erased volume is written to seven times to ensure the data can't be restored.
Using a block copy is faster, but it does have some limits that affect when it can be used, the most important being that copying block by block requires that both the source and destination devices be first unmounted from your Mac. This ensures that block data doesn't change during the copy process. Don’t worry, though; you don’t have to do the unmounting.
Disk Utility’s Restore function takes care of that for you. But it does mean that neither the source nor the destination can be in use when you use the Restore capabilities.