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To erase a Macintosh hard disk you can boot with a different disk and use the Disk Utility.

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For OS X 10.2-10.7:

For earlier versions of Mac OS X, including Mac OS X Mavericks 10.9, Mac OS X Mountain Lion 10.8, Mac OS X Lion 10.7, Mac OS X Snow Leopard 10.6, Mac OS X Leopard 10.5, Mac OS X Tiger 10.4, and before, the process to obtain those installers differs a bit. Downloading Mac OS X. Make a backup of any files that you want to keep.Erasing your Mac permanently deletes its files. If you want to restore your Mac to factory settings, such as to prepare it for a new owner, first learn what to do before you sell, give away, or trade in your Mac.

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Note:This refers to a full Mac OS X 10.2.3 or later CD included with a computer, not to the update-only 10.2.3 CD. Steps for zeroing data:

These steps assume you have a Mac OS X 10.2.3 or later CD:

1. Insert the Mac OS X CD.
2. Restart the computer.
3. Immediately after the startup sound, press and hold the 'C' key to start up from CD.
4. When the Installer screen appears, do not click Continue. Instead, choose Installer > Open Disk Utilities.
5. Select the hard drive to erase.
6. Click the Erase tab.
7. Select the volume format from the Volume Format pop-up menu.
8. Click Options.
9. Select the checkbox for 'Zero all data'.
10. Click OK.
11. Click Erase.

For a more secure method of erasing of data, you can select the checkbox '8 Way Random Write Format' instead of or in addition to selecting 'Zero all data.' This process could take several hours.

For OS 10.8 and newer:

Secure Erase is documented in the Help menu of the Disk Utility application. Disk Utility has shipped on all OS X versions in /Applications/Utilities folder.

To erase your computer's startup disk, you must start up from another disk, such as an OS X installation disc or from the Recovery Disk. All new OS devices come with a built-in Recovery Disk which can be used by restarting and holding down the R key. A Recovery Disk can also be created on an external hard disk or thumb drive using the Recovery Disk Assistant:

Securely erase a disk in OS X 10.8 or newer

The following is a summary of the Disk Utility help available from the Help menu when running the Disk Utility application:

You can securely erase a disk or partition to make sure the confidential information it contains cannot be recovered.

When erasing a disk or partition, Disk Utility does not erase the actual files; it erases only the information used to access the files. Many commonly available disk recovery apps can easily recover the files. When securely erasing a disk or partition, Disk Utility writes over the erased files, so they can never be recovered. You can choose how many times to write over the files. Becky mac os. Writing over the files several times is more secure than writing over them once, but it takes longer.

Securely erasing a disk erases files on all its partitions. Securely erasing a partition erases all the files on that partition but does not affect other partitions.

You can't securely erase a CD, DVD, or a solid-state drive. Glimmer of gold mac os. If you don't want data recovered from a solid-state drive, use full disk encryption. Deville highschool demo mac os.

To erase your computer's startup disk, you must start up from another disk, such as an OS X installation disc or from the Recovery Disk .

1. Open Disk Utility application from the Utility Folder in the Applications folder or select it from the list when booting from the Recovery Disk.
2. Select the disk or partition to erase, and then click Erase.
3. Specify a format, and enter a name for the disk.
4. Click Security Options, use the slider to choose how many times to write over the data on the disk, and click OK. Writing over the data three times meets the U.S. Department of Energy standard for securely erasing magnetic media. Writing over the data seven times meets the U.S. Department of Defense 5220-22-M standard. Single pass or 'Zeroing out' the date is adequate for most
5. Click Erase.

Also for those wanting to 'Clean' individual files, note this section from the technote:

Mac OS X 10.3+ feature – Secure Empty Trash

You can securely empty the Trash in Mac OS X Panther. While in the Finder, from the File menu choose Secure Empty Trash.

Note: When you securely empty the Trash, the deleted data cannot be recovered by disk utilities. You should only do this if you have a backup or you are sure you will never need the data again.

For machines which boot only MacOS 9 or less use either Drive Setup, Apple HD SC Setup, or Internal HD Format and select the option to zero out and/or low level format the disk. These programs are usually in the Utilities Folder on the install CDs for the various versions of the MacOS.

These steps apply only to Mac computers with an Intel processor. The steps to erase a Mac with Apple silicon are different.

Before erasing your Mac

• Make a backup of any files that you want to keep. Erasing your Mac permanently deletes its files.
• If you want to restore your Mac to factory settings, such as to prepare it for a new owner, first learn what to do before you sell, give away, or trade in your Mac. Then erase your Mac as the final step.

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Use Disk Utility to erase your Mac

1. Start up from macOS Recovery: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command (⌘) and R.
2. If asked, select a user you know the password for, then enter their administrator password.
3. From the utilities window, select Disk Utility and click Continue.
   
4. Select Macintosh HD in the sidebar of Disk Utility. Don't see Macintosh HD?
   
5. Click the Erase button in the toolbar, then enter the requested details:
   • Name: Macintosh HD
   • Format: APFS or Mac OS Extended (Journaled), as recommended by Disk Utility
6. Click Erase Volume Group. If you don't see this button, click Erase instead.
   
7. If asked, enter your Apple ID. Forgot your Apple ID?
8. After the erase is done, select any other internal volumes in the sidebar, then click the delete volume (–) button in the toolbar to delete that volume.
   Disregard any internal volume named Macintosh HD or Macintosh HD - Data, as well as any volumes in the External and Disk Images sections of the sidebar.
9. Quit Disk Utility to return to the utilities window.
10. If you want to start up again from the disk you erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions to reinstall macOS.
    

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If you don't see Macintosh HD in Disk Utility

Your built-in startup disk should be the first item listed in the Disk Utility sidebar. It's named Macintosh HD, unless you changed its name. If you don't see it there, choose Apple menu  > Shut Down, then unplug all nonessential devices from your Mac and try again.

If your disk still doesn't appear in Disk Utility, or Disk Utility reports that the erase process failed, your Mac might need service. If you need help, please contact Apple Support.

Learn more

For more information about using Disk Utility, see the Disk Utility User Guide.