Erasing your Mac permanently deletes its files. ![]() If you upgrade to macOS Catalina from an earlier version of macOS, the read-only volume is created during the upgrade process.ĭe plus, What happens if I delete Macintosh HD data? Make a backup of any files that you want to keep. What is Macintosh data HD? The Disk Utility app in macOS Catalina shows that Macintosh HD is the read-only system volume and Macintosh HD – Data contains the the rest of your files and data. Allow installation to complete without putting your Mac to sleep or closing its lid. ![]() Ainsi, Do I install on Macintosh HD or Macintosh HD data? If the installer offers you the choice between installing on Macintosh HD or Macintosh HD – Data, choose Macintosh HD.
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