Copy and paste the following exact command into the terminal window:
1. "This copy of the Install OS X Mavericks application cannot be verified..." mavericks os x 10.9.x dmg
Apple includes a built-in tool called createinstallmedia inside the installer package. This is the safest and most reliable way to write the DMG data to a flash drive. Plug your USB flash drive into your Mac. Open (Finder > Applications > Utilities). Select your USB drive and click Erase . Copy and paste the following exact command into
Mavericks is the "sweet spot" for older hardware (specifically Core 2 Duo machines) that cannot run macOS Sierra or High Sierra. It runs significantly faster on older spinning hard drives (HDDs) than the later APFS-based file systems used in High Sierra and newer. mavericks os x 10.9.x dmg