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This is an article on how to delete all data on a Windows or macOS computer, including the operating system. Formatting a computer means erasing all the data on the hard drive and reinstalling Windows or macOS to start over like new. This is useful when your computer is not working properly or you want to sell it and don’t want the buyer to restore the data. Fortunately, Windows and macOS both have an easy-to-use formatting tool that simplifies the process.
Steps
Windows 10
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of Windows. This is the gear icon on the Start menu.
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- Erasing the drive is important when you want to sell or give away your computer. The reason is because formatting the hard drive makes it difficult for others to recover deleted files. If you’re still using your computer, you can click Just remove my files to skip the drive formatting step.
- A more thorough way to wipe the hard drive is to use a third-party data erasing tool like DBAN (Darik’s Boot and Nuke). If you use a disk eraser program, make sure you have a Windows 10 recovery drive or DVD so you can reinstall the operating system. You should learn how to erase a hard drive for more details.
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- If you’re using a laptop, make sure you’ve connected the device to a power source so that formatting is not interrupted.
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Windows 8.1
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- If the computer’s original operating system was Windows 8 instead of Windows 8.1, formatting and reinstalling will return the device to Windows 8. [2] X Trusted Source Microsoft Support Go to Source However, Don’t worry – you still have a chance to upgrade your computer to Windows 8.1 for free right after you install it.
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. This is the gear icon on the Charms menu.
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- If you still use your computer and don’t worry about others accessing your deleted files, you can click Just remove my files. Thus, the drive will not be formatted.
- A more thorough way to wipe the hard drive is to use a third-party data erasing tool like DBAN (Darik’s Boot and Nuke). DBAN and similar tools prevent other people from finding pieces of deleted files, so this is a useful option if you want to sell or give away to your computer. Just make sure you have recovery media so you can reinstall Windows right after. Learn how to erase a hard drive for more details.
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- If you’re using a laptop, make sure you’ve connected the device to a power source so that formatting is not interrupted.
- After the computer formatting process is complete, the computer will restart and proceed to reinstall Windows. Follow the on-screen instructions if you want.
macOS
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- You can release your hands from the keys when you see the Apple logo or the start screen.
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- Name: Enter a name to identify the hard drive.
- Format: Leave your internal hard drive’s default format as APFS unless you have a specific reason not to. [4] X Research Sources
- Scheme: Select Choose GUID Partition Map
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- If your computer has multiple hard drives, you can format them now using Disk Utility.
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- If you want to reinstall macOS on this drive, restart the computer into Recovery Mode by pressing Contrp + R when the computer boots, and select Reinstall macOS to reinstall from scratch or Restore From Time Machine Backup if you have backed up your operating system to Time Machine).
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 7,656 times.
This is an article on how to delete all data on a Windows or macOS computer, including the operating system. Formatting a computer means erasing all the data on the hard drive and reinstalling Windows or macOS to start over like new. This is useful when your computer is not working properly or you want to sell it and don’t want the buyer to restore the data. Fortunately, Windows and macOS both have an easy-to-use formatting tool that simplifies the process.
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