This clears user settings from memory and restores certain security features that might have been altered. Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. Click the “Erase” button, then select a file system format and enter a name for it.When the Utilities window appears, select Disk Utility.Turn on your Mac and continue to press and hold the power button until the startup options window comes up.How do I wipe my Mac hard drive completely? At that rate, even three passes would take over 10 hours. My 640 GB drive might then take nearly 24 hours. I found one estimate, based on a test with a 500 GB External Drive connected with Firewire 800, which took 18 hours 22 minutes for a 7-pass erase, yielding an estimate of 0.314 minutes per GB. ![]() How long does it take to erase Mac hard drive?
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