Issue/Question
- Computer with Fusion Drive will not start.
Environment
- Oregon State University
- macOS
- Fusion Drive
Explanation
Fusion Drive is a type of hard drive for Mac computers. For more information about Fusion Drives, see: https://support.apple.com/en-us/HT202574
The version of Disk Utility that comes with Fusion Drive is unique. Earlier versions of Disk Utility can't be used with a Fusion Drive.
Resolution
If your system will not start because you see a flashing question mark or another alert:
- Press the Power button and hold it down to power off your system.
- Press the Power button again. After you hear the startup chime, press and hold Command-Option-R to start up to the Internet version of OS X Recovery.
- A globe should appear with a "Starting Internet Recovery" message. It is now OK to release Command-Option-R.
- A progress bar should appear and Internet Recovery should start and ask you to select a language.
- Once you select a language, click Disk Utility in the window that appears and then click Continue.
- If your Fusion Drive can be fixed with Disk Utility, you'll see a Disk icon with red lettering. Click the disk icon.
- A dialog box appears offering to fix the Fusion Drive (shown above).
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Caution: Clicking Fix will erase your Fusion Drive. If you have a Time Machine backup of your Fusion Drive Mac, see Mac 101: Time Machine for information on how to restore from a Time Machine backup once the drive has been erased.
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- After the process is complete, the volume will change color to black. Quit Disk Utility, click Install OS X, then click Continue.
For assistance, contact the IS Service Desk.