1. Big Data Mac Os X
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Reinstalling the OS of your Mac is sometimes required as a last resort option when troubleshooting a certain software problem. If none of the other fixing methods have worked out so far, this final fixing method should be enough to bring things back to normal and restore your Mac to its regular state.

If your Mac previously had the macOS Sierra 10.12.4 version of the OS or a later version, you can also use the Shift + Option + Command + R combination once you start the computer (press and hold the mentioned buttons) instead of the two previous combinations to make macOS Recovery install the OS version that was originally on your Mac when you. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the. Cisdem Data Recovery can be a lifesaver for many of us. Losing important files can be a big problem for us. Fortunately, this software solves this issue. Overall, this is a good data recovery software for Mac.

However, before you continue with the macOS reinstallation, we advise you to make sure that you have indeed exhausted all other options and made sure that this really is the only thing that you haven’t tried so far. If that is your case and you are sure you wish to continue, here is a guide that can help you with the reinstallation process.

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Accessing macOS Big Sur Recovery

MacOS Recovery is a special mode that gives you access to different system repair tools that can help you deal with different issues that your Mac has. In the macOS Recovery Mode, you can use the Time Machine backup tool, get online help for your problem, erase the hard drive of your Mac, reinstall your macOS, and more.

Entering Recovery Mode is a bit different depending on whether your Mac has an Apple Silicon or an Intel processor. To find out the type of processor that your Mac has, click on the Apple Menu, select About this Mac, and look at the information in the window that opens. If you see an entry labeled Chip with the model of the chip written after it, this means that your Mac is with an Apple Silicon processor. If instead of that there is a “Processor” entry followed by the specific processor model, it means that your Mac is equipped with an Intel processor. Depending on which one of the these two your Mac has, do either of the following:

  • Macs with Apple Silicon processors: With the computer turned off, press and hold down the Power Button, wait for the Startup Options screen to get displayed on your screen, and then release the button. Now select the Options icon and click on Continue.
  • Macs with Intel processors: Make sure that your Mac is connected to the Internet and turn it off. Then start the computer and immediately after that hold down the Command ⌘ + R keys from the keyboard. Keep holding them until the Apple logo (or another image) gets displayed on the screen.

If your Mac requires you to log in to any of your Mac accounts, select an account you know the password for and that has Admin privileges.

Reinstalling macOS Big Sur from Recovery Mode

Now that you have entered Recovery Mode on your Mac, it is time to reinstall the OS of the computer.

  1. From the Utilities screen of the macOS Recovery, select the Reinstall option and click on Continue.
  2. Follow the on-screen instructions and steps – they will guide you through the whole process.
  3. Be sure to adhere to the following tips while in the process of reinstalling macOS.
    • Do not put your Mac to sleep or close its lid while the reinstallation process is underway. While macOS is being reinstalled, your Mac may restart several times and the screen may go black and stay that way for several minutes – even if this happens, stay patient and wait for the process to complete. Until macOS gets reinstalled, do not close, put to sleep, or turn off your MacBook!
    • If you are asked to unlock the disk of your Mac, do so by filling in the password that you use to log in to your main Mac account.
    • If the macOS installer cannot find your disks or it tells you that the installation cannot be completed on the specified disk, you may first need to erase that disk and try again.
    • If you are given the choice between installing Macintosh HD or Macintosh HD Data, pick the first option.

Once the installation of macOS is complete, you will be asked to set up the preferences of the computer. Complete the set up according to your personal preferences and you will be good to go.

If you have reinstalled the OS because you intend to sell or give away your Mac and want to allow its new owner to set it up themselves, press Command-Q to close the Setup Assistant and leave the setting-up process to the future owner of the computer. After that, click on the Shut Down button to turn off the Mac.

Additional options and tips for installing/reinstalling macOS

The default setting of macOS Recovery is that it will install the latest version of the operating system that was previously installed on the computer. If you want, you can get it to install a different version of the OS by using one of the following options:

  • On a Mac with an Intel processing unit, you can press down and hold the Option + Command + R keyboard combination (instead of the Command ⌘ + R combination) as soon as you turn on the computer. This will cause macOS Recovery to install the latest stable macOS version that is compatible with the machine. There are two exceptions here:
    • If macOS Sierra 10.12.4 or another later version of macOS has never before been installed on the computer, the macOS version that will get installed will be the one that originally came with the machine, or another macOS version that is closest to the original one.
    • If the computer is equipped with the Apple T2 Security Chip and a macOS update has never before been installed on the machine, macOS Recovery will install the latest version of the OS that was installed on the computer.
  • If your Mac previously had the macOS Sierra 10.12.4 version of the OS or a later version, you can also use the Shift + Option + Command + R combination once you start the computer (press and hold the mentioned buttons) instead of the two previous combinations to make macOS Recovery install the OS version that was originally on your Mac when you bought it or the closest other OS version that is still available.
  • To install a different macOS version that macOS Recovery doesn’t allow you to install, you can instead go to the App Store and install the desired OS version from there.
  • Another way to reinstall your macOS is to create a bootable USB drive and install the desired OS version from it.
  • If the logic board of your Mac has just been replaced after your machine has been repaired by a technician, it is likely that macOS Recovery will only offer you to install the latest OS version that is compatible with the computer.
  • If the entire disk of your Mac has just been erased (instead of only the startup volume), macOS Recovery will probably only allow you to install the version of the OS that came with the computer when you first bought it (or the closest other available macOS version).

Windows Migration Assistant transfers your contacts, calendars, email accounts, and more from a PC. It migrates this data to the appropriate places on your Mac. After migrating data to your Mac, authorize your computer for iTunes Store purchases. It’s important to authorize before you sync or play content that you download from the iTunes Store.

If you're migrating from one Mac to another Mac, follow the steps to move your content to a new Mac.

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Before you begin

To prepare for a smooth migration:

  • Make sure that Windows is up to date. Migration Assistant works with Windows 7 and later.
  • Make sure that you know the name and password of an administrator account on your PC.
  • Connect your Mac and PC to the same network, such as your home Wi-Fi network. Or connect an Ethernet cable between the ports on your Mac and PC to create a direct network connection. Some Mac models require an Ethernet adapter, such as the Belkin USB-C to Gigabit Ethernet Adapter or Apple Thunderbolt to Gigabit Ethernet Adapter.
  • If you're using Microsoft OneDrive on your PC, follow Microsoft's instructions for uninstalling OneDrive before continuing. You can reinstall OneDrive after migration is complete.

Then use the check disk (chkdsk) utility on your PC to make sure that your Windows hard drive doesn’t have any issues:

Mac
  1. Right-click the Start button, then click Run.
  2. Type cmd and press Enter. Command Prompt opens.
  3. At the prompt, type chkdsk and press Enter.
  4. If the utility reports that it found problems, type the following, where drive is the letter that represents your Windows startup disk, such as D:
  5. Press Enter.
  6. At the prompt, type Y, then restart your PC.
  7. Repeat this process until the check disk utility reports no issues. If the utility can't fix every issue that it finds, you might need to have your PC serviced. Then migrate your data to your Mac.

Move your data

This section guides you through migration, post-migration, and what to do if the steps don’t work for you.

How to move your information from a PC to your Mac

  1. On your PC, download and install the appropriate Windows Migration Assistant, based on the version of macOS on your Mac:
    • Windows Migration Assistant for macOS Big Sur
    • Windows Migration Assistant for macOS Mojave and macOS Catalina
    • Windows Migration Assistant for macOS Sierra and High Sierra
    • Windows Migration Assistant for OS X El Capitan or earlier
  2. Quit any open Windows apps.
  3. Open Windows Migration Assistant, then click Continue.
  4. Start up your Mac. Setup Assistant automatically opens the first time you turn on your Mac. If you’ve already set up your Mac, open Migration Assistant, which is in the Utilities folder of your Applications folder.
  5. On your Mac, follow the onscreen prompts until you get to the migration pane of the assistant. Select the option to transfer your information “From a Windows PC,” then click Continue.
  6. When prompted, enter an administrator name and password.
  7. Click Continue to close any other open apps.
  8. In the migration window on your Mac, select your PC from the list of available computers. Then wait for the PC to show the same passcode that your Mac shows.
  9. When both computers display the same passcode, click Continue on your PC and Mac.
  10. Your Mac scans the drives on your PC to build a list of information to migrate. When the scan completes, select the information that you want to migrate to your Mac and click Continue. Learn about some of the data that you can transfer.

You can watch the progress and estimated time remaining on both the PC and your Mac. They tell you when migration is complete.

After you move your data

When migration completes, close Windows Migration Assistant on your PC. Then log in to the new user account on your Mac. The first time you log in to a user account migrated from your PC, you’re asked to set a password. You can use the same password that you used on your PC, or create a new password.

After logging in to the user account that you migrated, authorize your computer for iTunes Store purchases. It’s important to authorize before you sync or play content downloaded from the iTunes Store.

If you have issues moving your data

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  • Quit all open apps on your PC, then try migrating your content again. For example, you can press Alt-Tab to choose an open application, then press Alt-F4 to quit it.
  • If your PC doesn't appear in the Setup Assistant or Migration Assistant window on your Mac, make sure the computers are connected to the same network. You can create a network by connecting a single Ethernet cable between your Mac and PC. If that doesn't help, check for firewall software on your PC and turn it off. After migration completes, you can turn firewall software on again.
  • If Migration Assistant doesn’t open on your PC, turn off any antivirus software on your PC. Then try to open Migration Assistant again. After migration completes. You can turn that software on again.
  • If you still can't migrate your information successfully, you can use an external drive or file sharing to manually copy important data to your Mac.

What data can I transfer?

Migration Assistant lets you choose the data to move to your Mac. Here’s what moves over for specific apps and data types:

Email, contacts, and calendar information
Email messages, email-account settings, contacts, and appointments move based on which version of Windows you're using and which accounts you have.

Outlook1
Data from 32-bit versions of Outlook in Windows 7 and later move as follows:

  • People move to Contacts2
  • Appointments move to the Calendar app
  • IMAP and Exchange settings and messages move to the Mail app
  • POP settings and messages move to Mail2

Windows Live Mail
Data from Windows Live Mail in Windows 7 and later moves as follows:

  • IMAP settings and messages move to Mail
  • POP settings and messages move to Mail2

Windows Mail
Data from Windows Mail in Windows 7 and later (excluding Windows 8) move as follows:

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  • IMAP settings and messages move to Mail
  • POP settings and messages move to Mail2
  • People move to Contacts

Bookmarks
Bookmarks from Internet Explorer, Safari for Windows, and Firefox move to Safari.

System settings
Language and location settings, and custom desktop pictures move to System Preferences. Your web browser homepage moves to Safari preferences.

Pictures
Photos and other images move to your home folder. You can then add them to Photos, or open Photos and let it search your Mac for photos to import.

iTunes content
Migration Assistant transfers your iTunes media as follows: music to the Apple Music app, videos to the Apple TV app, podcasts to the Apple Podcasts app, and audiobooks to the Apple Books app.

Other files
Migration Assistant also moves these files:

  • Files from the top-level folder of the currently logged-in user’s home directory
  • Non-system files located in the Windows or Program Files folders
  • Top-level folders located on the Windows system disk and other attached disks

1. Migration Assistant doesn’t support 64-bit versions of Outlook. You can manually migrate Mail, Contacts, or Calendars from Outlook 2013 or Outlook 2016 by signing in and entering the content on your Mac manually.

2. Migration Assistant transfers only the Mail or Contacts data that belongs to the logged-in Windows user. To transfer data from another user account, use Migration Assistant again while you’re logged in to another Windows account. Each time you migrate, your Mac creates a new user account.

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