I want to stress that this should only likely be used if you absolutely immediately need to reclaim the disk space. Otherwise macOS does a pretty good job in managing the unused disk space for local backups and purging when it deems necessary. After installing Catalina and you go to About This Mac-Storage, your disk might be nearly full even though you actually don't have that many files to fill up your disk. Claim your free space back by doing the following: 1) Open the Terminal app 2) Type: tmutil listlocalsnapshots. MacBook Air (13-INCH, MID 2011), Systeemversie: Mac OS X 10.7.4 (11 Posted on Oct 30, 2013 12:18 AM. What is Adblock Plus? Adblock Plus is the most popular browser extension available for Mozilla Firefox, Google Chrome, Opera and Android. Its primary purpose is to remove all intrusive advertisements from your browsing experience: YouTube video ads, Facebook ads.

• How To Make MacOS Screenshots Even Easier(TechRepublic Video)
• Ok Now The Thing Is That My MacBook Is Not Restarting At All.I Tried To Do A Backup On An External Drive In The Recovery Mode, But This Also Failed...
• How To Get Old Versions Of MacOS - Apple Support

Ok, I checked the format of the Macintosh HD and it is Mac OS Extended (Journaled). I am not using Fusion Drive or SSD and I have no BootCamp Partition or other OS installed. I tried to do the rename as described above and the same message appeared again. Then I opened the Disk Utility and did the Verify/Repair and it said that everything is ok.

Start up from macOS Recovery

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

How To Make MacOS Screenshots Even Easier(TechRepublic Video)

Intel processor

Make sure that your Mac has a connection to the internet. Then turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password.

Reinstall macOS

Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

• If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
• If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
• If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
• Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.

After installation is complete, your Mac might restart to a setup assistant. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

Other macOS installation options

When you install macOS from Recovery, you get the current version of the most recently installed macOS, with some exceptions:

Ok Now The Thing Is That My MacBook Is Not Restarting At All.I Tried To Do A Backup On An External Drive In The Recovery Mode, But This Also Failed...

• On an Intel-based Mac: If you use Shift-Option-Command-R during startup, you're offered the macOS that came with your Mac, or the closest version still available. If you use Option-Command-R during startup, in most cases you're offered the latest macOS that is compatible with your Mac. Otherwise you're offered the macOS that came with your Mac, or the closest version still available.
• If the Mac logic board was just replaced, you may be offered only the latest macOS that is compatible with your Mac. If you just erased your entire startup disk, you may be offered only the macOS that came with your Mac, or the closest version still available.

You can also use these methods to install macOS, if the macOS is compatible with your Mac:

How To Get Old Versions Of MacOS - Apple Support

• Use the App Store to download and install the latest macOS.
• Use the App Store or a web browser to download and install an earlier macOS.
• Use a USB flash drive or other secondary volume to create a bootable installer.