OS X Mountain Lion does not boot after the creation of a Fusion Drive

core-storageefifusion-drive

I have followed a guide to set up the core storage logical volume to use one SSD and one HDD.

Since then, I have encountered multiple errors such as:

  • 69822 Couldn’t rediscover disk after operation
  • 69780 Unable to create a new CoreStorage Logical Volume
  • …

When created my Fusion Drive, I inverted disk0 (HDD) and disk1 (SSD) in the first command to create a Logical Volume Group.

If I boot normally (not in safe mode), the machine hangs at Apple logo … even if I try to boot from an external drive or a Mountain Lion startup drive.

Could this be a problem of the EFI version (2.7)?

Hardware: Macbook Pro 15" early 2011 (8,2)

Best Answer

It seems that some early 2011 15" Macbook Pro (8,2) machines have trouble creating a Fusion Drive.

It's being discussed in this MacRumors forum thread: http://forums.macrumors.com/showthread.php?t=1480179&page=16. This is the post that gives more datailed information about the problem http://forums.macrumors.com/showpost.php?p=16321849&postcount=384

It might be a hardware problem, there is no known solution yet.

Update: I have just created a working Fusion Drive on my early 2011 15" 2.3Ghz Macbook Pro (8,2), following the instructions in the answers here: Can I make a DIY Fusion Drive? I have installed Mountain Lion on it. I used a 250GB Samsung 840 Pro in the hdd bay and placed the original 750GB hdd in place of the optical drive. Maybe the hardware troubles are only present in the 2.0Ghz versions.

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