Click on your Mac's startup drive in the Disk Utility sidebar. It should be the drive at the top of the sidebar if there are multiple drives. Click First Aid. First Aid will run, checking the health of your Mac's drive. This process could take a little while. Click Disk Utility in the Menu bar. Click Quit Disk Utility. Select BaseSystem.dmg in Disk Utility's sidebar, and then click the Restore button in the main part of the window. Drag the BaseSystem.dmg icon into the Source field on the right (if it isn't. 2020 UPDATED VIDEO: SUSCRIBE: to restore your Mac back to it's factory settings with Yosemite OS X w. But this tool is not compatible with Yosemite and later. Need a recovery disk stored on a removable storage medium. We've got a separate article showing how to create a Mac recovery disk.). A recovery disc, in general is a media for storing a backup of all original factory or preferred settings and other important data. It is quite necessary to have a backup recovery option in case of data loss.
Want to learn how to create a bootable USB installer for OS X Yosemite?. Here is the complete step by step guide which you can follow on your MAC create the bootable USB disc. We all know that Yosemite OS X is the latest operating system form Apple, which comes with lots of new features and improvement. If you are interested in new OS and want to try it then sign up for the OS X Beta Program here, which will allow them to test the new OS, if selected.
Once you have the installation app for Yosemite (Install OS X 10.10 Developer Preview), don't install it directly, other wise you will lose the file and can't make the USB disc. To get started all you nee a *GB or above USB drive, Apple computer with Mac App Store (10.6.8+) and OS X Yosemite installer.
Create OS X Yosemite Bootable USB Drive
Step 1. Xbox application mac. Insert the USB drive or Disc on youir MAC and run the Disk Utility app from the Applications > Utilities folder.
Step 2. Now in the app select the USB drive and Selct the Partition Tab.
Step 3. Under Partition Layout, select 1 Partition from the drop-down menu. And enter the Partition information Name: 'yosemite', Format: 'Mac OS Extended (Journaled)'.
Step 4. Click the Options.. button and Select GUID Partition Table. After that hit the 'Ok' button then 'Partition' button. Seagate backup plus drive mac.
Recovery Disk Mac Yosemite 10.10
Step 5. Now the partition process will start and this will take some time to format and making USB drive as a 1 partition
Now the USB part is over and lets move to the OS X Yosemite installer package.
Step 6. Go to Applications again and find the Install OS X 10.10 Developer Preview app that you downloaded.
Step 7. Right-click the installer and select Show Package Contents from the context menu. See the Screenshot below:-
Step 8. Now navigate to Contents -> SharedSupport and open InstallESD.dmg
Step 9. This will start the verify process on your MAC. Wait for some time…….
Step 10. Once the verify process is done you will see the Package Folder.
Step 11. Don't do anything with this Packages folder just yet. First, we need to unhide the files located in this newly mounted OS X Install ESD image.
Step 12. Launch Terminal.app to enter a command to unhide the file and folder on your MAC.
Step 13. Enter the below mention two commands one by one:-
defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
Step 14. Now you will see three more files next to the Package folder (Step 10)
Once you have the installation app for Yosemite (Install OS X 10.10 Developer Preview), don't install it directly, other wise you will lose the file and can't make the USB disc. To get started all you nee a *GB or above USB drive, Apple computer with Mac App Store (10.6.8+) and OS X Yosemite installer.
Create OS X Yosemite Bootable USB Drive
Step 1. Xbox application mac. Insert the USB drive or Disc on youir MAC and run the Disk Utility app from the Applications > Utilities folder.
Step 2. Now in the app select the USB drive and Selct the Partition Tab.
Step 3. Under Partition Layout, select 1 Partition from the drop-down menu. And enter the Partition information Name: 'yosemite', Format: 'Mac OS Extended (Journaled)'.
Step 4. Click the Options.. button and Select GUID Partition Table. After that hit the 'Ok' button then 'Partition' button. Seagate backup plus drive mac.
Recovery Disk Mac Yosemite 10.10
Step 5. Now the partition process will start and this will take some time to format and making USB drive as a 1 partition
Now the USB part is over and lets move to the OS X Yosemite installer package.
Step 6. Go to Applications again and find the Install OS X 10.10 Developer Preview app that you downloaded.
Step 7. Right-click the installer and select Show Package Contents from the context menu. See the Screenshot below:-
Step 8. Now navigate to Contents -> SharedSupport and open InstallESD.dmg
Step 9. This will start the verify process on your MAC. Wait for some time…….
Step 10. Once the verify process is done you will see the Package Folder.
Step 11. Don't do anything with this Packages folder just yet. First, we need to unhide the files located in this newly mounted OS X Install ESD image.
Step 12. Launch Terminal.app to enter a command to unhide the file and folder on your MAC.
Step 13. Enter the below mention two commands one by one:-
defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
Step 14. Now you will see three more files next to the Package folder (Step 10)
Step 15. Switch back to Disk Utility.app to select the partition name created in step 3.
Step 16. Now drag the partition from the device list to the Destination box. Also, drag the BaseSystem.dmg to the Source path
Hit the Restore button.
Step 17. Now a new popup screen appears. From here click on Erase to start the restore process, then enter in your admin password and hit OK to proceed.
Step 18. Once the restore process is done, you will see a new window son your screen. Like the screen below:-
Step 19. Here, open the 'System' > 'Installation' folders and move the Packages file to trash.
Step 20. Now copy the Packages folder from Step 10 and paste it into the Installation folder that you just opened in previous step.
Step 21. Now Hide the system files again using this command on terminal window
defaults write com.apple.finder AppleShowAllFiles NO
Mac Mini Recovery Disk
That's it!. To perform a clean install on your MAC, simply insert the USB drive that you created, power on the computer, and hold down the [option] key to access the boot selection menu. From there, select the USB drive partition, and follow the prompts to install OSX 10.10 on your Mac.
