Mac Recovery HD Volume: Reinstall OS X or Troubleshoot

The Recovery HD volume can start up your Mac in an emergency and provide access to troubleshooting utilities as well as allow you to reinstall OS X.

macbook pro - Disk needs repaired but it doesn't? - Ask Different

Mac Recovery HD Volume: Reinstall OS X or Troubleshoot

macOS Recovery — ALSOFT

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How to Install, Reinstall, or Restore macOS Using Internet

How to Install, Reinstall, or Restore macOS Using Internet