I’ve never had a problem with it, but should an unlikely problem occur, you don’t want to be left staring dumbly at a file-free hard drive. I would be remiss if I didn’t caution you to have a solid backup of your data before doing this. If you’re an International Man/Woman of Mystery, you can choose one of the other options with the understanding that while they more thoroughly overwrite your data, they take a very long time to do so. If you like, Mail can be set to automatically delete sent mail and Junk. It’s adequate for most people (though you’ll want to keep an eye on this story’s comments as some people have nearly religious views on this matter). Mac cleanup software saves people hours and hours of time. As is all other Apple software, Mail is easily customized to your liking. The default, Zero Out Deleted Files, writes zeros over the drive’s free space. Under Lion you see a slider that offers essentially the same options. With Snow Leopard this sheet offers Zero Out Deleted Files, 7-Pass Erase of Deleted Files, and 35-Pass Erase of Deleted Files. A sheet will appear that offers you different levels of erasure. To do this, launch Disk Utility (/Applications/Utilities), select the drive that you want to work with, click the Erase tab, and click on Erase Free Space.
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