Step 1 Download and Install the Wipe Mac Application, Run It. Download and install the program on your Mac, then launch the program from desktop shortcut. Note: As you can see, it offers three wiping options for your needs, 'Erase File/Folers' and ' Wipe Drive' and 'Wipe Unused Space', you seleect the one based on your actual needs. Download and run FonePaw MacMaster on your Mac. Select the file type you want to clean, such as system junks, duplicate photos.

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These instructions apply only to Mac computers with an Intel processor.
Erasing your Mac permanently deletes all of its files, so make sure that you make a backup of any files that you want to keep. If you're attempting to restore your Mac to factory settings, first learn what to do before you sell, give away, or trade in your Mac.

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. You may then be asked to select a user you know the password for. Select the user, then click Next and enter their administrator password.

Use Disk Utility to erase your disk

1. From the utilities window in macOS Recovery, select Disk Utility and click Continue.
   
2. Select Macintosh HD in the sidebar of Disk Utility. Don't see Macintosh HD?
   
3. Click the Erase button in the toolbar, then enter the requested details:
   • Name: Continue to use Macintosh HD as the name, or enter a different name.
   • Format: Continue to use APFS or Mac OS Extended (Journaled), as recommended by Disk Utility.
4. Click Erase Volume Group. If you don't see this button, click Erase instead.
   
5. If Find My is turned on for this Mac, you may be asked to enter your Apple ID to authorize the erase. Forgot your Apple ID?
6. After the erase is done, select any other internal volumes that may be listed in the sidebar, then click the delete volume (–) button in the toolbar to delete each volume.
   You don't need to delete the Macintosh HD volume you just erased, or any external volumes or disk images.
7. Quit Disk Utility to return to the utilities window.
8. If you want to start up again from the disk you erased, you should now reinstall macOS on that disk.

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.

If you’re buying a new Apple Watch, you’ll probably either be selling your old one to help pay for the new hotness, or you’ll be giving it away to a deserving relative or friend. (It would have to be a REALLY good friend.)

Before selling or giving away your old Watch, make sure to wipe it clean. This removes any of your apps and personal data, as well as turns off Activation Lock, so the new owner won’t have any issues pairing it with their iPhone.

How To Wipe Your Apple Watch Clean Before Selling It

On Your iPhone:

1.) Tap the “Watch” app icon on your iPhone to load the “Watch” app.

2.) Tap the “My Watch” icon in the lower left hand corner of the Watch app screen.

3.) Near the top, you’ll find a picture of your Watch, with its name beside it. Mine is called “Chris’s Apple Watch.” Tap that.

4.) On the next screen, tap the “Information” icon found to the right of your Apple Watch’s name. It looks like a lower-case “i” in a circle.

5.) Tap “Unpair Apple Watch.”

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6.) Confirm you want to unpair your Watch from your iPhone, by tapping “Unpair” when the slide up menu appears.

On Your Apple Watch:

1.) Open the Settings app on your iPhone.

2.) Tap “General” in the “Settings” menu.

3.) Tap “Reset” in the “General” menu.

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4.) Tap “Erase All Content and Settings” in the “Reset” menu.

All data and apps will be removed form the device, and it will be reset to the same state it was in when you first took it out of the box.

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For more tips and tricks that can help you make better use of your Mac, iOS device, Apple Watch, or Apple TV, be sure to visit the “How To” section of our website.