Repair Disk isn’t the first option you should choose if your Mac is ailing, but it is helpful when (for example): Performance has degraded Data is missing You are experiencing degraded system ...

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.

If you already have a Windows installation disc, then you may not need to create a System Repair or Recovery Disc in Windows 11/10. But if you do not have one, then it is better to create and keep it ...