A Bot To Repair Mac OS

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  1. A Bot To Repair Mac Os Catalina From Earlier Dates
  2. A Bot To Repair Mac Os Installation

And then look for the name of your main hard drive. It could be /dev/sda or /dev/nvme0n1, depending on if you have a standard SATA drive, or an NVMe drive, respectively.If you have multiple drives, look at the sizes of the partitions and for the linux-swap partition to help identify the main OS drive. Check that USB port on your Mac. Plug into a different USB port or plug another device in and see if that works OK. If you use a USB hub bacause your MacBook has no USB 3.0 port, also make sure the hub is not faulty. Try using a different USB cable with the USB drive to see if that fixes the non-readable problem.

A Bot To Repair Mac OS

A Bot To Repair Mac Os Catalina From Earlier Dates

All you need to do is carry around a single USB flash drive to be ready for situations the require you to diagnose, repair, or experiment with Mac OS X. One of the maintenance tools every Mac user should have available in case of emergency is a bootable copy of Mac OS X on a removable device. 1 Month ago I downloaded the update 'Mountain Lion'. About 2 weeks ago I removed some of the OS X Mountain Lion System files (Twitter, Facebook, etc) After I deleted some of the system files, if I quit Notes, Contacts and other apps they freeze. I have also noticed other issues with the Mac. Restart using Startup Manager: Restart your Mac, then immediately press and hold the Option key. When the Startup Manager window appears, release the Option key, select your macOS startup disk, then press Return. If you’re using a Mac notebook computer with an external keyboard, make sure you press and hold the Option key on the built-in keyboard.

These key combinations apply only to Mac computers with an Intel processor, not Mac computers with Apple silicon.

To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Keep holding until the described behavior occurs.

A Bot To Repair Mac Os Installation

  • Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're prompted to enter the password.
  • Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password.
  • Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
  • Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
  • D: Start up to the Apple Diagnostics utility. Or use Option-Dto start up to this utility over the Internet. Disabled when using a firmware password.
  • N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
  • Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
  • T: Start up in target disk mode. Disabled when using a firmware password.
  • Command-V: Start up in verbose mode. Disabled when using a firmware password.
  • Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.

If a key combination doesn't work

If a key combination doesn't work at startup, one of these solutions might help:

  • Press and hold all keys in the combination together, not one at a time.
  • Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
  • Wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use.
  • If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
  • If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.

Remember that some key combinations are disabled when your Mac is using a firmware password.

Learn more

  • Keyboard shortcuts that you can use after your Mac has started up.