But be aware that more passes take more time.
When you select multiple passes, the drive is erased multiple times to remove all data traces. In this sheet, Disk Utility gives you a number of erasure options, including Zero Out Data, 7-Pass Erase, and 35-Pass Erase. So if you want to make sure that all existing data is truly gone, click on Security Options instead. It’s not easy to access files erased in this way, but a knowledgeable hacker (or a disk-recovery service) could ferret them out. Your Mac now considers the space free and will write over the data as new information is added. What’s gone is the catalog directory, or the “pointers,” to the files. The disk will now appear empty, even though your data is actually still there. The quick and easy way is to select a volume, choose the Erase tab, and click on the Erase button. Whether you’re selling your old computer or cleaning out your virtual desk before moving to another job, sometimes you want to erase everything that’s on your hard drive.
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