120024: Startup Disk: Document and Software contains the ReadMe document for StartUp Disk 9.2.1, with links to the software downloads. 31370: Mac OS: "Can't Open Preferences File" Message covers what ...
Disk Utility is Apple's go-to macOS app for finding and repairing common disk errors, but if it's your Mac's internal disk that's the problem, then your Mac might not even start up into macOS.
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