Summary
Presented as a single volume on your Mac, Fusion Drive automatically and dynamically moves frequently used files to Flash storage for quicker access, while infrequently used items move to the hard disk. As a result you'll enjoy shorter startup times, and as the system learns how you work you'll see faster application launches and quicker file access. Fusion Drive manages all this automatically in the background.
Frequently Asked Questions
Do I need to configure Fusion Drive?
When ordered with a Fusion Drive, your iMac or Mac mini is pre-configured.
When ordered with a Fusion Drive, your iMac or Mac mini is pre-configured.
Can external USB, FireWire, or Thunderbolt hard drives be added to Fusion Drive?
External drives cannot be added to Fusion Drive.
Can I add a partition to the hard disk with Fusion Drive?
Using Disk Utility, you can add one partition to the hard disk on Fusion Drive. Once you add the partition, the "plus" symbol in Disk Utility to add additional partitions will be grayed out. You cannot partition the Flash storage.
If I create a hard disk partition is it part of Fusion Drive?
The additional partition is not part of Fusion Drive. The new partition is a separate volume that is physically located on the hard disk drive.
Can I add a Windows partition?
You can create one additional partition on the hard disk with Fusion Drive. You can create either a Mac OS X partition or a Windows partition.
External drives cannot be added to Fusion Drive.
Can I add a partition to the hard disk with Fusion Drive?
Using Disk Utility, you can add one partition to the hard disk on Fusion Drive. Once you add the partition, the "plus" symbol in Disk Utility to add additional partitions will be grayed out. You cannot partition the Flash storage.
If I create a hard disk partition is it part of Fusion Drive?
The additional partition is not part of Fusion Drive. The new partition is a separate volume that is physically located on the hard disk drive.
Can I add a Windows partition?
You can create one additional partition on the hard disk with Fusion Drive. You can create either a Mac OS X partition or a Windows partition.
If creating a Windows partition, use Boot Camp Assistant to create it, not Disk Utility. From the Go menu, chooseUtilities. Then, double-click Boot Camp Assistant and follow the onscreen instructions. For more information on Boot Camp see the Boot Camp support page.
Note: Boot Camp Assistant is not supported at this time on 3TB hard drive configurations.
I receive a "disk is too small for this operation" message when creating a partition. Why?
The partition you are trying to create has a larger size than free space available on the hard disk drive. Reduce the size of the partition you are trying to create and try again.
Can a Fusion Drive be mounted on another system in Target Disk Mode?
Yes, but the system attempting to mount the Fusion Drive in Target Disk Mode must have OS X Mountain Lion version 10.8.2 or later. A Fusion Drive will not appear as a Target Disk Mode volume or startup disk on earlier versions of Mac OS X.
Note: Boot Camp Assistant is not supported at this time on 3TB hard drive configurations.
I receive a "disk is too small for this operation" message when creating a partition. Why?
The partition you are trying to create has a larger size than free space available on the hard disk drive. Reduce the size of the partition you are trying to create and try again.
Can a Fusion Drive be mounted on another system in Target Disk Mode?
Yes, but the system attempting to mount the Fusion Drive in Target Disk Mode must have OS X Mountain Lion version 10.8.2 or later. A Fusion Drive will not appear as a Target Disk Mode volume or startup disk on earlier versions of Mac OS X.
Can third-party disk utilities be used with a Fusion Drive?
Third party disk utilities may or may not work with a Fusion Drive. Check with the third-party software vendor to check for compatibility with a Fusion Drive.
I'm using video capture software and it reports frame drops during sustained captures. What could be wrong?
Your project's capture requirements may exceed the sustained capture rate available to your Fusion Drive. Try capturing a smaller segment of the source or reduce its resolution.
Third party disk utilities may or may not work with a Fusion Drive. Check with the third-party software vendor to check for compatibility with a Fusion Drive.
I'm using video capture software and it reports frame drops during sustained captures. What could be wrong?
Your project's capture requirements may exceed the sustained capture rate available to your Fusion Drive. Try capturing a smaller segment of the source or reduce its resolution.
I've recently reset NVRAM (Non-Volatile Random Access Memory, also known as PRAM) and now my Fusion Drive is starting up more slowly. How can I fix this?
The reset removed your Startup Disk setting from NVRAM. To access the setting, choose System Preferencesfrom the Apple () menu. Then, click Startup Disk and then Macintosh HD. Note: You may have to click the lock icon at the bottom of the window and enter your system administrator password to manage this setting.
The reset removed your Startup Disk setting from NVRAM. To access the setting, choose System Preferencesfrom the Apple () menu. Then, click Startup Disk and then Macintosh HD. Note: You may have to click the lock icon at the bottom of the window and enter your system administrator password to manage this setting.
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