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felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
hello. at once i apologize for my english. i didn't find any help at forums on my language, so i came here.
well, i'm not sure how to describe my problem, but it's connected with corestorage and fusion drive.
it all started when i deleted windows from my mac. i had missed 1tb with it and wanted to return them back. after deleting windows i've formed fusion drive. i tried all and came to the terminal's command "diskutil cs delete [disk name]". i deleted macintosh hd.
i didn't really know what happened to my mac after this. now my mac has two disks with: 1tb (if i open partition it has 2tb. i can use only 1tb, and other 1tb is free memory, i can't combine them) and the other one got 120gb, they both called "untitled". when i click on "install OS" its offer to choose between 2 disks.
i don't really know should i add screenshots, because it's all in russian, i can't switch language, after this manipulation my mac is grey screened.
also, after command "diskutil cs list" in terminal it says "no corestorage logical volume groups found".
also, i have no time machine back ups.
i want to return all to the factory settings
i hope that i've properly described my problem, i really need help :(
if there's not enough information i'll try to give more!
 
Last edited:

felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
Post

Follow the steps in my older post here ^ to rebuild the Fusion drive.

You will need to do this from Internet recovery which is accessed by holding command-option-r at startup.
how can i find out core storage LVG UUID again? i closed terminal after this command to look at the disk utility..
[doublepost=1520759207][/doublepost]
Post

Follow the steps in my older post here ^ to rebuild the Fusion drive.

You will need to do this from Internet recovery which is accessed by holding command-option-r at startup.
also my fusion drive has 1tb of memory instead of 2tb, how can i return missing memory back?
 

Weaselboy

Moderator
Staff member
Jan 23, 2005
32,553
12,377
California
how can i find out core storage LVG UUID again? i closed terminal after this command to look at the disk utility..

Run "diskutil cs list" in Terminal and you should be able to see it.

also my fusion drive has 1tb of memory instead of 2tb, how can i return missing memory back?

You need to make sure you format the entire drive as shown in this post. That will get it back to one large partition.
 

felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
Run "diskutil cs list" in Terminal and you should be able to see it.



You need to make sure you format the entire drive as shown in this post. That will get it back to one large partition.
after command “diskutil cs createVolume....” it says “your logical volume group already has a logical volume”
now it looks like this, fusion still has 1tb of memory. i didn’t get how to return full memory back, because i do not have macintosh hd
 

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Weaselboy

Moderator
Staff member
Jan 23, 2005
32,553
12,377
California
Since you tried to make the Fusion drive once already without formatting the disk completely. You need to start over.
 

Weaselboy

Moderator
Staff member
Jan 23, 2005
32,553
12,377
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okay, thanks for answering, and how can i start over? what should i do?
Boot to Internet recovery then in Terminal run both of these.

diskutil cs delete "Fusion Drive"
diskutil cs delete Untitled

Then erase both disks by selecting the disk itself at the top of the left column and erase.

Then follow the steps to create the Fusion drive.
 

felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
Boot to Internet recovery then in Terminal run both of these.

diskutil cs delete "Fusion Drive"
diskutil cs delete Untitled

Then erase both disks by selecting the disk itself at the top of the left column and erase.

Then follow the steps to create the Fusion drive.
it says “Fusion Drive does not appear to be a valid Core Storage Logical Volume Group UUID or name”, the same with “Untitled”
 

Weaselboy

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Staff member
Jan 23, 2005
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it says “Fusion Drive does not appear to be a valid Core Storage Logical Volume Group UUID or name”, the same with “Untitled”
Okay... that is fine.

You still need to format the whole drive and you have not done that yet.

You need to enable show all devices like in my screenshot, then select the drive at the top like in my second screenshot, then erase.
 

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felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
Okay... that is fine.

You still need to format the whole drive and you have not done that yet.

You need to enable show all devices like in my screenshot, then select the drive at the top like in my second screenshot, then erase.
in my case the toppest disk is fusion drive. i can not click on “erase”
 

felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
You are still missing a step. Look at my screenshot. In Disk Utility click View at the top then checkmark "show all devices". Then you will be able to select the disk like in my second screenshot.
i did it, still have fusion on the top
 

felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
Run each of these commands in Terminal for me and tell me what the output of each is.

Code:
diskutil cs list

diskutil list


Code:
CoreStorage logical volume groups (1 found)

|

+-- Logical Volume Group 726AE748-4F95-45DA-A041-78842075F5CA

    =========================================================

    Name:         fusion

    Status:       Online

    Size:         1088856047616 B (1.1 TB)

    Free Space:   40960 B (41.0 KB)

    |

    +-< Physical Volume 17674240-CA51-4BB1-9ED6-3DECF055AC1C

    |   ----------------------------------------------------

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     120883990528 B (120.9 GB)

    |

    +-< Physical Volume A81D9942-A9E1-4ED2-B9B6-1EB97F32034F

    |   ----------------------------------------------------

    |   Index:    1

    |   Disk:     disk1s2

    |   Status:   Online

    |   Size:     967972057088 B (968.0 GB)

    |

    +-> Logical Volume Family 088E61CF-4C4A-42BA-A407-1CB6D77ABF3E

        ----------------------------------------------------------

        Encryption Type:         None

        |

        +-> Logical Volume 41727223-6048-4A0C-A906-461A6F083F9B

            ---------------------------------------------------

            Disk:                  disk3

            Status:                Online

            Size (Total):          1083001274368 B (1.1 TB)

            Revertible:            No

            LV Name:               Untitled

            Volume Name:           Untitled

            Content Hint:          Apple_HFS

            LVG Type:              Fusion, Sparse


-bash-3.2# diskutil list

/dev/disk0 (internal):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                         121.3 GB   disk0

   1:                        EFI EFI                     314.6 MB   disk0s1

   2:          Apple_CoreStorage fusion                  120.9 GB   disk0s2

   3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3


/dev/disk1 (internal, physical):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *2.0 TB     disk1

   1:                        EFI EFI                     209.7 MB   disk1s1

   2:          Apple_CoreStorage fusion                  968.0 GB   disk1s2

   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3


/dev/disk2 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        +2.1 GB     disk2

   1:                  Apple_HFS OS X Base System        2.0 GB     disk2s1


/dev/disk3 (internal, virtual):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Untitled               +1.1 TB     disk3

                                Logical Volume on disk0s2, disk1s2

                                41727223-6048-4A0C-A906-461A6F083F9B

                                Unencrypted Fusion Drive


/dev/disk4 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +5.2 MB     disk4


/dev/disk5 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk5


/dev/disk6 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk6


/dev/disk7 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk7


/dev/disk8 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +2.1 MB     disk8


/dev/disk9 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk9


/dev/disk10 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk10


/dev/disk11 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +12.6 MB    disk11


/dev/disk12 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +2.1 MB     disk12


/dev/disk13 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +1.0 MB     disk13


/dev/disk14 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +2.1 MB     disk14


/dev/disk15 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk15


/dev/disk16 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk16


/dev/disk17 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +1.0 MB     disk17


/dev/disk18 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +6.3 MB     disk18


/dev/disk19 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +6.3 MB     disk19


/dev/disk20 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +524.3 KB   disk20


/dev/disk21 (disk image):

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                            untitled               +2.1 MB     disk21
 
Last edited by a moderator:

Weaselboy

Moderator
Staff member
Jan 23, 2005
32,553
12,377
California
ok, i made the fusion drive, but still didn’t understand how to resize memory. i have 2 disks with 1tb on each, again
I still don't think you are properly erasing the hard drive before making the Fusion drive. I can see here where it is still only 967GB. After killing the Fusion drive you need to open Disk Util and go to the erase tab and select AppleHDD where I have marked it and erase to Mac OS Extended (Journaled).

Somehow you are missing this step.

0AA5975B-FBB6-4640-9C78-AB3227F609E7.jpg
 

felisett

macrumors newbie
Original poster
Mar 10, 2018
11
3
I still don't think you are properly erasing the hard drive before making the Fusion drive. I can see here where it is still only 967GB. After killing the Fusion drive you need to open Disk Util and go to the erase tab and select AppleHDD where I have marked it and erase to Mac OS Extended (Journaled).

Somehow you are missing this step.

View attachment 754032
omg, you are the best, thanks so much! it worked!
 

nicetry25

macrumors newbie
Oct 1, 2019
3
1
Trying to wipe my hard drives and reinstall macOS. Disk Utility Tool giving me the Core Storage error. Opened up Terminal to follow @Weaselboy 's instructions. and that's failing also get's to 33.3% then hangs then errors out:
"Error: -69783: Unable to delete the CoreStorage Logical Volume Group"

Below is my diskutil cs list and my diskutil list.. any help is appreciated!!

Code:
-bash-3.2# diskutil cs delete "Macintosh HD"
The Core Storage Logical Volume Group UUID is 0FCCB277-A74E-4ED5-BE0E-F560BDD205D9
Started CoreStorage operation
Unmounting Logical Volumes
Destroying Logical Volume Group
Error: -69783: Unable to delete the CoreStorage Logical Volume Group
-bash-3.2# diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 0FCCB277-A74E-4ED5-BE0E-F560BDD205D9
    =========================================================
    Name:         Macintosh HD
    Status:       Offline
    Size:         250140434432 B (250.1 GB)
    Free Space:   -none-
    |
    +-< Physical Volume FC304FAA-01FE-4F4B-B18B-66CB58C147A2
        ----------------------------------------------------
        (No properties)
-bash-3.2# diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            250.1 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *128.3 GB   disk2
   1:                  Apple_HFS Install macOS Mojave    128.3 GB   disk2s1

/dev/disk3 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +2.1 GB     disk3
   1:                  Apple_HFS macOS Base System       2.0 GB     disk3s1

/dev/disk4 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +5.2 MB     disk4

/dev/disk5 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk5

/dev/disk6 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk6

/dev/disk7 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk7

/dev/disk8 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk8

/dev/disk9 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk9

/dev/disk10 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk10

/dev/disk11 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +12.6 MB    disk11

/dev/disk12 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +4.2 MB     disk12

/dev/disk13 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk13

/dev/disk14 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk14

/dev/disk15 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk15

/dev/disk16 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk16

/dev/disk17 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk17

/dev/disk18 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk18

/dev/disk19 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk19

/dev/disk20 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk20

/dev/disk21 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk21

/dev/disk22 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk22

-bash-3.2#
 

Weaselboy

Moderator
Staff member
Jan 23, 2005
32,553
12,377
California
What is odd there is I only see one internal drive. Were you trying to make a Fusion drive out of two drives?

How are you booted when trying to do this? Are you in command-option-r Internet recovery like you should be?
 

nicetry25

macrumors newbie
Oct 1, 2019
3
1
What is odd there is I only see one internal drive. Were you trying to make a Fusion drive out of two drives?

How are you booted when trying to do this? Are you in command-option-r Internet recovery like you should be?

This is a past employees MacBook Pro, no idea what they did to it. Had the flashing folder when attempting to boot it up. I was just trying to wipe and re-install, but running into issues.

I might have been using the bootable MacOS USB, so I retried without the USB and confirmed comand-option-r Internet Recovery and same issue. Below is the list again without the USB:

Code:
-bash-3.2# diskutil cs delete "Macintosh HD"
The Core Storage Logical Volume Group UUID is 0FCCB277-A74E-4ED5-BE0E-F560BDD205D9
Started CoreStorage operation
Unmounting Logical Volumes
Destroying Logical Volume Group
Error: -69783: Unable to delete the CoreStorage Logical Volume Group
-bash-3.2# diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 0FCCB277-A74E-4ED5-BE0E-F560BDD205D9
    =========================================================
    Name:         Macintosh HD
    Status:       Offline
    Size:         250140434432 B (250.1 GB)
    Free Space:   -none-
    |
    +-< Physical Volume FC304FAA-01FE-4F4B-B18B-66CB58C147A2
        ----------------------------------------------------
        (No properties)
-bash-3.2# diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            250.1 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3

/dev/disk1 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +2.1 GB     disk1
   1:                  Apple_HFS macOS Base System       2.0 GB     disk1s1

/dev/disk3 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +5.2 MB     disk3

/dev/disk4 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk4

/dev/disk5 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk5

/dev/disk6 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk6

/dev/disk7 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk7

/dev/disk8 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk8

/dev/disk9 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk9

/dev/disk10 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +12.6 MB    disk10

/dev/disk11 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +4.2 MB     disk11

/dev/disk12 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk12

/dev/disk13 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk13

/dev/disk14 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk14

/dev/disk15 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk15

/dev/disk16 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk16

/dev/disk17 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk17

/dev/disk18 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk18

/dev/disk19 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk19

/dev/disk20 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk20

/dev/disk21 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk21

-bash-3.2#
 

Weaselboy

Moderator
Staff member
Jan 23, 2005
32,553
12,377
California
Code:
diskutil cs delete 0FCCB277-A74E-4ED5-BE0E-F560BDD205D9

From Internet recovery try this command using the logical volume group UUID and see if that works.

It looks like they had FileVault encryption turned on, but it looks odd because nothing is shown in properties for the physical volume.

Then try to erase the whole disk with Disk Utility.

Enable show all devices then select the drive itself at the very top then erase the disk to macOS Extended Journaled. Then quit Disk Util and see if you can reinstall the OS.

Screen Shot 2019-10-04 at 3.23.50 AM.png
Screen Shot 2019-10-04 at 3.24.07 AM.png
 
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