I want to clean install the Catalina but there is Macintosh HD - Data so I'm confused to deal with this extra partition.

1 Answer 1


macOS Catalina runs on a dedicated, read-only system volume called Macintosh HD. This volume is completely separate from all other data to help prevent the accidental overwriting of critical operating system files. Your files and data are stored in another volume named Macintosh HD - Data. In the Finder, both volumes appear as Macintosh HD. https://support.apple.com/en-us/HT210650

Then, these are the procedure.

  • Click the Macintosh HD - Data (1) then click the minus above the Volume (2) enter image description here
  • Click the Macintosh HD (1) then click the Erase (2) enter image description here

The rest is the same as usual.

Copy right of the images: https://qiita.com/PaSeRi/items/59e9785580dbd518ac93

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