User profile for user: grandsire_doubles
grandsire_doubles Author
User level: Level 1
4 points

Problems after update from Monterey to Ventura

I have a 2019 27 inch Intel iMac. It was running perfectly with Montery but after system update I have major problems. History is:


  • Updated from Monterey to Sequoia but found several problems
    • Photos not working
    • Mail not working - couldn't access Exchange account
    • System settings not working - including no Apple ID
    • Time Machine incredibly slow
  • Used disk utility to erase, re-installed Monterey, and recovered from Time Machine backup
  • Still needed to update from Monterey for Microsoft Word updates, so updated to Ventura
  • Similar problems with Ventura to those with Sequoia
  • Attempted to reinstall Ventura from Recovery
    • Process was incredibly slow - left overnight and update stalled
    • Shut down and re-started - went straight into Internet Recovery
    • Disk Utility Macintosh HD and Macintosh HD-Data have disappeared
    • APPLE SSD has a volume disk0s2 which cannot be mounted
    • APPLE HDD has a volume disk1s2 that cannot be mounted


I just want my computer to work again - I have relatively recent Time Machine backups, so I'm not bothered about losing a few files. Any advice gratefully received!



iMac 27″, macOS 13.7

Posted on Apr 8, 2025 9:30 AM

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User profile for user: K Shaffer
K Shaffer
User level: Level 8
35,956 points

Posted on Apr 8, 2025 10:56 AM

Perhaps your drive configuration has become unpaired, or shows two

storage drives with one of them a rotational HDD and smaller SSD?


These need to be bonded or paired in order to run correctly.


This is referred to as a Fusion Drive. And with macOS, also

the actual system, would be divided into two parts; One is

used by the System data, the other, is your files, separately.


A Fusion drive won't work once broken into two.

There may be a hardware issue -- or the two

might be repaired and made to work as one.


How to fix a split Fusion Drive - Apple Support

//support.apple.com/en-us/102226


However once these fail to work together, cure

maybe you need to replace a failed drive unit.

[And that iMac might be rather labor intensive

since the display likely is glued into the case..]


You may correctly identify the iMac, exactly.

'About this Mac' is OK, but don't show Serial

Numbers; security risks may be higher then.


See an example of a configuration with Two drives:

Confused by 27" iMac and two hard drives - Apple Community

//discussions.apple.com/thread/251932654?

(This discussion has info on how to re-pair or fix

the problem, make backup and repair Mac w/ it.)


And run an EtreCheck report, set it so it gets

ALL the information, an option within the app

(which is a 'safe non-invasive' diagnostic.)


How to use EtreCheckPro for free:

https://etrecheck.com/en/index.html


How to use the 'Add Text Feature' When Posting large amounts of text… - Apple Community

//discussions.apple.com/docs/DOC-250000211


Above has detailed instructions, & one of them tells

how to use this info, to make a Report to post in ASC.

•This report would allow those who wish to use it, to

help you figure how to resolve the iMac issues; from

inside these Apple discussions forum page.


View in context

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2 replies
Question marked as Top-ranking reply
User profile for user: K Shaffer
K Shaffer
User level: Level 8
35,956 points

Apr 8, 2025 10:56 AM in response to grandsire_doubles

Perhaps your drive configuration has become unpaired, or shows two

storage drives with one of them a rotational HDD and smaller SSD?


These need to be bonded or paired in order to run correctly.


This is referred to as a Fusion Drive. And with macOS, also

the actual system, would be divided into two parts; One is

used by the System data, the other, is your files, separately.


A Fusion drive won't work once broken into two.

There may be a hardware issue -- or the two

might be repaired and made to work as one.


How to fix a split Fusion Drive - Apple Support

//support.apple.com/en-us/102226


However once these fail to work together, cure

maybe you need to replace a failed drive unit.

[And that iMac might be rather labor intensive

since the display likely is glued into the case..]


You may correctly identify the iMac, exactly.

'About this Mac' is OK, but don't show Serial

Numbers; security risks may be higher then.


See an example of a configuration with Two drives:

Confused by 27" iMac and two hard drives - Apple Community

//discussions.apple.com/thread/251932654?

(This discussion has info on how to re-pair or fix

the problem, make backup and repair Mac w/ it.)


And run an EtreCheck report, set it so it gets

ALL the information, an option within the app

(which is a 'safe non-invasive' diagnostic.)


How to use EtreCheckPro for free:

https://etrecheck.com/en/index.html


How to use the 'Add Text Feature' When Posting large amounts of text… - Apple Community

//discussions.apple.com/docs/DOC-250000211


Above has detailed instructions, & one of them tells

how to use this info, to make a Report to post in ASC.

•This report would allow those who wish to use it, to

help you figure how to resolve the iMac issues; from

inside these Apple discussions forum page.


Reply

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Problems after update from Monterey to Ventura

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