Apart from the default startup disk, Mac computers can be set to start up from a different disk like an external drive, network volume, or a USB ...

How to repair your boot disk/startup disk with Disk Utility You can run First Aid on your startup drive following the steps above, but if Disk Utility finds any errors it won’t attempt to fix them.

We've all been there: you're merrily working on your Mac when you try to save a file and a window pops up to proclaim, "Your startup disk is almost full - you need to make more space available on ...

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 your Mac is having problems, macOS has multiple keyboard combinations that you can hold to recover your system, start in safe mode, run diagnostics, and more. Here's how to use them.

The last two options require a T2 chip. To run Startup Security Utility on an Intel Mac, power on your Mac and hold down Command ()-R on the keyboard. This enters macOS Recovery.