4 Replies
      Latest reply: Jun 7, 2017 6:45 AM by Cesarito2016 RSS
      MacRR Level 1 Level 1 (0 points)

        Hi,

         

        I have problems with Fusion Drive. I installed the beta version of MacOS High Sierra and I returned back to macOS Sierra 10.12.5, but the Fusion drive is divided into two sections. What should I do?

        Internet recovery did not help?

        I have iMac 27 "Retina 5k late 2014 and 1Tb Fusion drive

        • Re: problems with Fusion Drive
          Cesarito2016 Level 1 Level 1 (10 points)

          Hi, I had the same problem.

          To fix it I had to create the Fusion drive as follows:

           

          http://www.macworld.com/article/2014011/storage-drives/how-to-make-your-own-fusion-drive.html

          Good luck!
          • Re: problems with Fusion Drive
            cryptooth Level 1 Level 1 (0 points)

            You need to boot your mac with USB installation thumb drive. After that;

             

            Open Terminal

            type

            diskutil list
            
            

             

            and press enter.

             

            It will list your disks like this:

             

            /dev/disk0 (internal, physical):

              #:                      TYPE NAME                    SIZE      IDENTIFIER

              0:      GUID_partition_scheme                        *121.3 GB  disk0

              1:                        EFI EFI                    209.7 MB  disk0s1

              2:          Apple_CoreStorage LogicVolGroup          121.0 GB  disk0s2

              3:                Apple_Boot Boot OS X              134.2 MB  disk0s3

            /dev/disk1 (internal, physical):

              #:                      TYPE NAME                    SIZE      IDENTIFIER

              0:      GUID_partition_scheme                        *1.0 TB    disk1

              1:                        EFI EFI                    209.7 MB  disk1s1

              2:          Apple_CoreStorage LogicVolGroup          999.3 GB  disk1s2

              3:                Apple_Boot Recovery HD            650.0 MB  disk1s3

             

            drive1 is /dev/disk0 and drive2 is /dev/disk1 (as sample)

             

            Type following command and press enter dont forget to change disk name (/dev/disk0 etc)

             

            diskutil coreStorage create LogicalGroup /dev/disk0 /dev/disk1
            
            

             

            When the process is done, your logical volume group should be completed You can find a unique identifier for the group, which you should copy to your clipboard. its starting wth UDID like this : 50B457C3-ADC6-4EDC-9ABA-FD8C6EEDE69A (change with your UDID)


            Final command is:

             

            diskutil coreStorage createVolume 50B457C3-ADC6-4EDC-9ABA-FD8C6EEDE69A jhfs+ "Macintosh HD" 100%
            

             

            After that, you can fresh install macOS to newly created logical drive from USB or internet recovery. And restore from TimeMachine Backup.

             

            Cheers

            • Re: problems with Fusion Drive
              clane47 Level 2 Level 2 (25 points)

              I recovered mine like this:

               

              ( ALL DATA WILL BE LOST! )

              Start up in internet recovery mode with command-shift-R. Start the Terminal app from the utilities menu and paste in this line at the prompt:

              ( The following is all one line. Select all of it ! )

               

              N=Macintosh\ HD; for d in /dev/disk?; do o=`diskutil info $d`; [[ ! "$SSD" ]] && grep -lqw 'APPLE SSD' <<< "$o" && SSD=$d; [[ ! "$HDD" ]] && grep -lqw 'APPLE HDD' <<< "$o" && HDD=$d; [[ "$SSD" && "$HDD" ]] && break; done; diskutil cs create "$N" $SSD $HDD && diskutil cs createLV "$N" jhfs+ "$N" 100%

               

              Incidentally, I got this info from here:

               

              https://discussions.apple.com/thread/7453778?start=0&tstart=0