Macintosh HD is designed to store the operating system files and applications only, which is also called the system volume. Which one to erase, Macintosh HD or Macintosh HD - Data?įrom macOS 10.15 Catalina, the internal hard drive of a Mac is segregated into two separate entities. Some Macs may show macOS and macOS - Data these two volumes as well.īut why there are Macintosh HD and Macintosh HD - Data? In this article, we provide a straightforward and informative overview to help you understand what they are and the difference between Macintosh HD and Macintosh HD - Data. And you will know which one you should erase when reinstalling or downgrading macOS. If you have updated to macOS 10.15 Catalina and later on your Mac, you must have noticed that there are two volumes in Disk Utility, one named Macintosh HD, and another called Macintosh HD - Data.
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