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1. MAC WILL NOT DELETE PROTECTED HARD DRIVE FOR NEW INSTALL SOFTWARE
2. MAC WILL NOT DELETE PROTECTED HARD DRIVE FOR NEW INSTALL FREE

MAC WILL NOT DELETE PROTECTED HARD DRIVE FOR NEW INSTALL FREE

The advantage is that your computer remains available (though often slow) while this operation is underway.Īlong with both Secure Erase and the Erase Free Space options, which can take a very, very long time even for a single pass, you’ve got two other options, one of which you don’t need to enable. Now use the Erase Free Space option, which also offers 1, 3, and 7 passes of erase, and only empties out unused parts of the disk. After you boot, launch Disk Utility, select the startup volume, and click the Erase tab. First, erase a drive without the overwriting part, and reinstall OS X. There’s a slightly different way to accomplish the same goal. You’ll save a little time if you do an erase without overwriting, then reinstall OS X, then Erase Free Space with an overwriting option. Select Disk Utility from the startup menu, and you can erase your startup drive securely. Restart a Mac and hold down Command-R after the startup chime sounds, and the computer boots into the recovery mode. But this has become easier since OS X Recovery was added in Lion. Then you’d run Disk Utility to erase your startup drive. Securely erase your hard drive with Disk Utility.īefore Lion, you had to boot from a CD or DVD system disk or a third-party utility, like Disk Warrior, or from an external drive with OS X installed. Once is considered enough for regular purposes, while three and seven correspond to different U.S. When you select a volume in Disk Utility and then the Erase tab, you can click Security Options to pick how many times the drive is overwritten: once, three times, or seven times. That’s been built into Apple’s Disk Utility for years. To get rid of old data in a thorough fashion, you need use a multi-pass approach, in which every bit of storage in the disk is overwritten with new data (often zeroes). But it doesn’t make all the files on the disk unrecoverable-it just makes them harder to retrieve. Such an erase was, in practice, the best way to create a clean installation.

MAC WILL NOT DELETE PROTECTED HARD DRIVE FOR NEW INSTALL SOFTWARE

In the olden days, in the long ago, we ran utility software that often came from third parties, which would simply delete the catalog and related records. Wiping or erasing a drive has a surprising number of definitions. Since I’m looking to resell my current Mac, how do I reinstall OS X, so as to wipe my hard drive and resell knowing the new buyer has a cleaned-up computer, and my files are nowhere to be found on it?