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Halleyscomet1997

macrumors newbie
Original poster
Oct 22, 2018
5
0
Mac problem - 20200502

Mac wouldn’t boot. Apple logo appeared, but progress bar on loading only went halfway across the screen, and then the mac would switch off.

On start up held Cmd + R key to go into macOS Utilities. The ran Disk Utility and received the following message, after running First Aid on Mackintosh HD

“File system resize support required, such as HFS+ with Journaling enabled. Operation Failed”

In the log, which produced the above error message, the following were also listed (not an exhaustive list)

Unable to bootstrap transaction group 495933: incorrect block type

Continue scanning metadata for an older checkpoint

Roll-back 1 commit checkpoint for stable state

Storage system check exit code is 0

Repairing file system

Volume was successfully unmounted


Various checks are then listed, followed by the message “The volume MackintoshHD appears to be OK”, “File system check exit code is 0”, “Restoring the original state found as mounted”, “Fixing size of logical volume to fill logical volume group”, “File system resize support required, such as HFS+ with Journaling enabled. Operation Failed”.

I fo not want to wipe my hard drive, as my last backup was some time ago.

Any suggestions would be much appreciated.

Thanks.
 
Which iMac?
What year made?
What kind of drive is inside?

Could the drive be failing?

Something tells me the only way to "fix" this WILL be to "wipe the hard drive" and start over with a full reformat.
 
Which iMac?
What year made?
What kind of drive is inside?

Could the drive be failing?

Something tells me the only way to "fix" this WILL be to "wipe the hard drive" and start over with a full reformat.
Hi,
Thanks for replying to my post.
I have a 2018 imac with a 2Tb hard drive, running High Sierra.
 
1. Boot to INTERNET recovery (you'll need your wifi password if you're using wifi)
Command-OPTION-R

2. You should see the spinning globe icon -- it will take a while to load

3. When the internet utilities come up, open disk utility.

4. Go to the view menu and choose "show all devices".

5. Now try the "first aid" option on the drives & partitions you see on the left.
DO NOT ERASE THEM!
First aid ONLY.

6. Does this help?
 
1. Boot to INTERNET recovery (you'll need your wifi password if you're using wifi)
Command-OPTION-R

2. You should see the spinning globe icon -- it will take a while to load

3. When the internet utilities come up, open disk utility.

4. Go to the view menu and choose "show all devices".

5. Now try the "first aid" option on the drives & partitions you see on the left.
DO NOT ERASE THEM!
First aid ONLY.

6. Does this help?
Sorry, but this may be basic, but how do I boot to internet recovery?

I have accessed Disk Utility by holding down Cmd + R whilst booting up, and run First Aid on the Fusion Drive, and then on the Mackintosh HD. First Aid reported no problems with the Fusion Drive, only the Mackintosh HD.
 
"Sorry, but this may be basic, but how do I boot to internet recovery?"

By re-reading the message I posted to you above.

It's possible the platter-based drive portion of the fusion drive is having problems.
It could be a software problem (fixed by a reformat), or... it could be a hardware problem (as in, "broken").

If it was mine, I would try erasing the fusion drive, and then restoring from my backup.
Even if the backup you have is from "a while ago", it's better than nothing.

It's probably the only way you're going to get things back to working again.
 
Hi,

Many thanks again for responding to my post. I've run First Aid on the Fusion drive and that seemed to be ok.
I think the problem is with the hard drive.

I have tried to run from a bootable Startup disk, but I get the message “The operation couldn't be completed. Permission denied.”

I have tried to do a reinstallation from Time Machine , but I get the message, “An error occurred while preparing the disk “MackintoshHD” – “Try erasing the Disk with Disk Utility or choosing a different disk to restore to”

It advised me to wipe the disk, which I tried to do, but I get the message, “Erase process has failed.” With a further message advising that. “Unmounting Disk3/Removing Logical Volume from Logical Volume Group/Unable to delete the Core Storage logical volume. Operation failed.

So, I believe the hard drive may need replacing. I have contacted Apple support and I'll wait to see what they advise before pulling the plug on the hard drive-ouch!!
 
Hi, I’M just getting exactly the same problem, could you share me how do you solve it?

Thanks!
 
Hi, I’M just getting exactly the same problem, could you share me how do you solve it?

Thanks!
Hi,
Below are the notes that I made to resolve the problem. It worked for me, but I obviously cannot be responsible if it doesn't work for you, or worse happens. Important to have a safe TM backup, the more recent the better.

Research the links so that you understand what to do. I had no prior knowledge of Terminal, and I haven't gone in there since, but it demonstrated to me how important it is to have even a small understanding of its workings, just in case anything like this happens again. I thought that I would have to replace my hard drive, which I wouldn't undertake. It was only because of the Covid-19 lockdown that prevented me from taking my mac to a mac repair shop. It forced me to have a go, which I'm very glad that I did.

Good Luck, I hope this works for you.

See below.

https://apple.stackexchange.com/que...to-delete-the-core-storage-local-volume-group

Disk Utility won’t let you erase or repartition an encrypted CoreStorage volume until you unlock or decrypt. This can be an issue for a CoreStorage volume that will not let you either unlock or decrypt.

To help with this, the diskutil tool provides a way to quickly delete CoreStorage volumes. This includes the ability to erase encrypted CoreStorage volumes without first decrypting or unlocking them.

To do this, first run the following command:

diskutil cs list
This will give you with a list of the CoreStorage volumes on your system. Unless you have a Fusion drive or multiple encrypted drives, your encrypted drive should be the only one listed.



In the listing, you will want to select and copy the Logical Volume Group (LVG) alphanumeric UUID for your CoreStorage volume. The LVG should be the first UUID listed and it’s the one we want to delete.

Next, run the following command:

diskutil cs delete UUID_here


This will delete your CoreStorage volume and reformat it as an unencrypted HFS+ volume.



After accomplishing this I reformatted both the Fusion drive and the Mackintosh HD and afterwards checked them both with the First Aid process in the Disk Utility programme.

I then restored using Time Machine back to November 2019, which was my last TM backup.

I had files since that date saved on Dropbox, but didn’t want these to be downloaded until after everything was ok. The paragraphs below may not be applicable to you.

Do NOT connect to the internet until the end of the following procedures, as I don’t want Dropbox to synchronise until the end, when I am satisfied that everything is as it should be.

Changed the name of the ‘Dropbox’ folder to ‘Dropbox 2’.

Ensure that a new Time Machine Backup is run.

Disconnect Hard Drives and erase mackintosh HD.

Set up Fusion Drive to run correctly – See the following recorded videos copies from YouTube:


Fixing a split Fusion Drive on a Mac with High Sierra MacOS, Mojave and Catalina - Bing video -.mpg

Need to make a Single Core Storage Logical Volume

Boot up holding down Cmd + R.

Erase both the Fusion Drive and Mackintosh HD in Disk Utility and UnMount both drives afterwards.

In Terminal window, enter Command ‘diskutil list’

Use the disk identifiers (disk0, and disk1) to create a Core Storage Volume, by entering the command “diskutil cs create MackintoshHD disk0 disk1”

Enter command “diskutil list”

Close the Terminal window and open a new Terminal window

Copy the Logical Volume Group identifier and use this identifier to paste into the following command “cs createVolume “identifier from above”jhfs+MackintoshHD 100%”

Enter command “diskutil list”

Reinstall files from Time Machine backup

Ensure that a new Time Machine Backup is run.
 
Hi,
Below are the notes that I made to resolve the problem. It worked for me, but I obviously cannot be responsible if it doesn't work for you, or worse happens. Important to have a safe TM backup, the more recent the better.

Research the links so that you understand what to do. I had no prior knowledge of Terminal, and I haven't gone in there since, but it demonstrated to me how important it is to have even a small understanding of its workings, just in case anything like this happens again. I thought that I would have to replace my hard drive, which I wouldn't undertake. It was only because of the Covid-19 lockdown that prevented me from taking my mac to a mac repair shop. It forced me to have a go, which I'm very glad that I did.

Good Luck, I hope this works for you.

See below.

https://apple.stackexchange.com/que...to-delete-the-core-storage-local-volume-group

Disk Utility won’t let you erase or repartition an encrypted CoreStorage volume until you unlock or decrypt. This can be an issue for a CoreStorage volume that will not let you either unlock or decrypt.

To help with this, the diskutil tool provides a way to quickly delete CoreStorage volumes. This includes the ability to erase encrypted CoreStorage volumes without first decrypting or unlocking them.

To do this, first run the following command:

diskutil cs list
This will give you with a list of the CoreStorage volumes on your system. Unless you have a Fusion drive or multiple encrypted drives, your encrypted drive should be the only one listed.



In the listing, you will want to select and copy the Logical Volume Group (LVG) alphanumeric UUID for your CoreStorage volume. The LVG should be the first UUID listed and it’s the one we want to delete.

Next, run the following command:

diskutil cs delete UUID_here


This will delete your CoreStorage volume and reformat it as an unencrypted HFS+ volume.



After accomplishing this I reformatted both the Fusion drive and the Mackintosh HD and afterwards checked them both with the First Aid process in the Disk Utility programme.

I then restored using Time Machine back to November 2019, which was my last TM backup.

I had files since that date saved on Dropbox, but didn’t want these to be downloaded until after everything was ok. The paragraphs below may not be applicable to you.

Do NOT connect to the internet until the end of the following procedures, as I don’t want Dropbox to synchronise until the end, when I am satisfied that everything is as it should be.

Changed the name of the ‘Dropbox’ folder to ‘Dropbox 2’.

Ensure that a new Time Machine Backup is run.

Disconnect Hard Drives and erase mackintosh HD.

Set up Fusion Drive to run correctly – See the following recorded videos copies from YouTube:


Fixing a split Fusion Drive on a Mac with High Sierra MacOS, Mojave and Catalina - Bing video -.mpg

Need to make a Single Core Storage Logical Volume

Boot up holding down Cmd + R.

Erase both the Fusion Drive and Mackintosh HD in Disk Utility and UnMount both drives afterwards.

In Terminal window, enter Command ‘diskutil list’

Use the disk identifiers (disk0, and disk1) to create a Core Storage Volume, by entering the command “diskutil cs create MackintoshHD disk0 disk1”

Enter command “diskutil list”

Close the Terminal window and open a new Terminal window

Copy the Logical Volume Group identifier and use this identifier to paste into the following command “cs createVolume “identifier from above”jhfs+MackintoshHD 100%”

Enter command “diskutil list”

Reinstall files from Time Machine backup

Ensure that a new Time Machine Backup is run.
Thank you for your fast answer! I didn’t make any TM backup never, so I think I’ll lost all my information :(
 
Thank you for your fast answer! I didn’t make any TM backup never, so I think I’ll lost all my information :(
Apple has literally the best backup system in the world for an OS.
I don’t understand why 99% of people I see don’t have a Time Machine backup 🤦‍♂️😂


Also :

  1. COMMAND+OPTION+R
  2. terminal.app

Code:
diskutil list
diskutil eraseDisk apfs ”macOS HD” /dev/disk<number>

Reinstall macOS.

These lines saves the day. Not complicated. Erases all partition on the drive and create APFS container for a clean macOS reinstall.
 
Last edited:
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Hi,
Below are the notes that I made to resolve the problem. It worked for me, but I obviously cannot be responsible if it doesn't work for you, or worse happens. Important to have a safe TM backup, the more recent the better.

Research the links so that you understand what to do. I had no prior knowledge of Terminal, and I haven't gone in there since, but it demonstrated to me how important it is to have even a small understanding of its workings, just in case anything like this happens again. I thought that I would have to replace my hard drive, which I wouldn't undertake. It was only because of the Covid-19 lockdown that prevented me from taking my mac to a mac repair shop. It forced me to have a go, which I'm very glad that I did.

Good Luck, I hope this works for you.

See below.

https://apple.stackexchange.com/que...to-delete-the-core-storage-local-volume-group

Disk Utility won’t let you erase or repartition an encrypted CoreStorage volume until you unlock or decrypt. This can be an issue for a CoreStorage volume that will not let you either unlock or decrypt.

To help with this, the diskutil tool provides a way to quickly delete CoreStorage volumes. This includes the ability to erase encrypted CoreStorage volumes without first decrypting or unlocking them.

To do this, first run the following command:

diskutil cs list
This will give you with a list of the CoreStorage volumes on your system. Unless you have a Fusion drive or multiple encrypted drives, your encrypted drive should be the only one listed.



In the listing, you will want to select and copy the Logical Volume Group (LVG) alphanumeric UUID for your CoreStorage volume. The LVG should be the first UUID listed and it’s the one we want to delete.

Next, run the following command:

diskutil cs delete UUID_here


This will delete your CoreStorage volume and reformat it as an unencrypted HFS+ volume.



After accomplishing this I reformatted both the Fusion drive and the Mackintosh HD and afterwards checked them both with the First Aid process in the Disk Utility programme.

I then restored using Time Machine back to November 2019, which was my last TM backup.

I had files since that date saved on Dropbox, but didn’t want these to be downloaded until after everything was ok. The paragraphs below may not be applicable to you.

Do NOT connect to the internet until the end of the following procedures, as I don’t want Dropbox to synchronise until the end, when I am satisfied that everything is as it should be.

Changed the name of the ‘Dropbox’ folder to ‘Dropbox 2’.

Ensure that a new Time Machine Backup is run.

Disconnect Hard Drives and erase mackintosh HD.

Set up Fusion Drive to run correctly – See the following recorded videos copies from YouTube:


Fixing a split Fusion Drive on a Mac with High Sierra MacOS, Mojave and Catalina - Bing video -.mpg

Need to make a Single Core Storage Logical Volume

Boot up holding down Cmd + R.

Erase both the Fusion Drive and Mackintosh HD in Disk Utility and UnMount both drives afterwards.

In Terminal window, enter Command ‘diskutil list’

Use the disk identifiers (disk0, and disk1) to create a Core Storage Volume, by entering the command “diskutil cs create MackintoshHD disk0 disk1”

Enter command “diskutil list”

Close the Terminal window and open a new Terminal window

Copy the Logical Volume Group identifier and use this identifier to paste into the following command “cs createVolume “identifier from above”jhfs+MackintoshHD 100%”

Enter command “diskutil list”

Reinstall files from Time Machine backup

Ensure that a new Time Machine Backup is run.
This really helped me sort out my Mac! Thank you so much. I was having the same problem and this sorted it. It's too late for you of course, but I wanted to share with others who may be having this issue and like us didn't have a recent back up. I managed to access the HD on my iMac (the one having the start up problem) using Target Disk mode. I used a thunderbolt cable and accessed the iMac HD from my Macbook Pro. I was then able to back up my data before following the steps above on my iMac. I hope this helps someone.
 
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