![]() Choose these options at your own discretion. One pass of writing zeros will clear all data from the volume with little or no chance of recovery. Note there are more secure erase options that add extra passes of zeroes to conform with DOE and DOD requirements, however this can drastically increase the time required to erase the drive. Click Erase a second time to confirm.ĭepending on the size of the volume, the process can take several minutes to well over an hour. Click on the drive you’d like to erase (not any of its indented partitions) and then click the Erase button in the toolbar. ![]() In Disk Utility, you should see a list of both your internal and external disks in the sidebar on the left. To perform the secure erase which it describes, you have to use the diskutil command in Terminal instead. Once it powers up and mounts in Finder, launch Disk Utility (found in the Applications > Utilities folder). A dialog box will drop down inside the window. Disk Utility doesn’t overwrite any free space at all.
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