What I have: - 27" 2012 Mac with 3TB Fusion Drive - 3.4 GHz Core i7 (3770) ("Ivy Bridge") processor - 24 GB RAM
I was trying to set it up with a Boot Camp partition for Windows 10. The story so far:
- Machine came with virgin install of Sierra. I restored from my Time Machine backup of my iMac 9,1 (also with Sierra installed), and everything worked normally.
- The new machine inherited the Time Machine backup from the old one and was fully backed up.
- I ran Boot Camp Assistant to download the Boot Camp files, put the Windows 10 iso on a flash drive, and partition the disk.
- During this process, I was only able to choose a maximum partition size for Windows of 640 GB, with the Mac partition being about 2454 GB if I recall correctly.
- The partitioning failed with an error message, and it told me to repair the disk in Disk Utility
- I went to Disk Utility and performed repair (on the 'whole disk' and the disk volume named Macintosh HD). No problems were found and the repair exited normally.
- I continued with Boot Camp Assistant, which had stayed open, and tried to partition the disk again. As before, 640 GB was the maximum allowable for Windows.
- The process appeared to hang, I left it for over half an hour before force quitting. I guess this was a bad mistake, perhaps it just takes a long time anyway.
- After force quitting, the Mac slowed to a crawl. I entered Disk Utility which showed the capacity as about 3 TB and the used space about 0.04 TB less than that. Before this, the used space was about 1.6 TB.
- I ran First Aid in Disk Utility and after this process the Disk Capacity was reduced to 1.67 TB with 0.04 TB free. The computer continued to run at a crawl, presumably because of the lack of free space on the disk.
- I booted off my Time Machine backup, which booted into the recovery environment.
- I erased the Fusion Drive, which restored the capacity to 3TB.
- Next, possibly another big mistake, I chose Restore and then chose my Time Machine disk. But I did this from inside Disk Utility rather than from the main menu of the recovery environment.
- The restore completed and verified. The Fusion Drive was now named 2TBTimeMachine instead of Macintosh HD.
- When I tried to reboot, the Apple logo appeared with a progress bar, and then a grey screen with a circle with a diagonal line through it.
- I booted from the Time Machine disk again (to the recovery environment). I ran First Aid, first on the whole disk, which appeared to fix one thing. I can't remember what this was but I remember it said '1 newer' of whatever it changed.
- I then ran First Aid on the disk named 2TBTimeMachine (i.e. the Fusion Drive), which found several problems and reported that it successfully fixed them. I'm sorry, I don't remember what issues it found and fixed.
- I tried rebooting again, which led to the same circle with diagonal line. Before that, I tried to select the startup disk from the recovery environment, which showed no startup disks available at all.
- Currently I am redoing the Time Machine backup from my old Mac and intend to try and restore that to the new Mac. I am writing this from the Internet Recovery Environment on my new Mac.
I have a few questions:
- What mistakes did I make in the process above?
- Will I be able to restore to the new disk without erasing it first (i.e. will it replace all content on the disk)? The reason I ask is because the Internet Recovery Environment seems to have an older version of Disk Utility, and I don't want to risk erasing the disk from this version of Disk Utility in case it doesn't know about Fusion Drives.
- Is there any benefit to installing Mac OS X Mountain Lion from the Internet Recovery Environment? I don't know why Mountain Lion is the only option here. Is it likely to cause further problems if I install Mountain Lion and from that install upgrade to Sierra?
- Do I need to 'rebuild' the Fusion Drive and can you provide or direct me to a clear set of instructions for doing this?