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System Data Partition Huge After Monterey Reinstall

I encountered a black screen of death in Monterey 12.4 and tried everything I could to resolve it to no avail. Thankfully I had a fresh Carbon Copy Cloner backup and decided just to wipe the internal drive and reinstall the OS from Recovery Mode. I did so, and restored the backup. Everything seemed to be going swimmingly until I checked my disk with Disk Utility: for some reason, even though this was a one to one migration to a fresh installation of Monterey on a zeroed disk, the data partition of my internal drive has gobbled up an extra 100 GB of space. I do not know why, and I do not know how to remedy it. I am running Monterey 12.4 on a Mac Studio, and any help would be greatly appreciated!

Mac Studio

Posted on Jul 17, 2022 10:54 AM

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Posted on Jul 17, 2022 2:15 PM

Firstly, under normal drive configurations, the Internal Drive has Only One Partition which is the Entire Drive Capacity.


There are additional Volumes which can be view by Terminal Command diskutil list


Good work 👍 and pleased the CCC Application came to the rescue


Notation regarding Drive filling up especially if CCC is used and configured to use the " SafetyNet " feature of CCC.


Would suggest checking the Developers Website specific to CCC


CCC SafetyNet may need to be tweaked to make fewer or no Snap Shot.


They will accumulate over time and if not moved in a CCC Process will start to occupy needed space resulting in your original issue

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Question marked as Top-ranking reply

Jul 17, 2022 2:15 PM in response to Jamie Berry

Firstly, under normal drive configurations, the Internal Drive has Only One Partition which is the Entire Drive Capacity.


There are additional Volumes which can be view by Terminal Command diskutil list


Good work 👍 and pleased the CCC Application came to the rescue


Notation regarding Drive filling up especially if CCC is used and configured to use the " SafetyNet " feature of CCC.


Would suggest checking the Developers Website specific to CCC


CCC SafetyNet may need to be tweaked to make fewer or no Snap Shot.


They will accumulate over time and if not moved in a CCC Process will start to occupy needed space resulting in your original issue

Jul 17, 2022 2:46 PM in response to PRP_53

Ok. Thank you Mal-S and P Philips. This was indeed a SafetyNet issue, I had a couple of snapshots that got copied over in my migration. Between your replies and the CCC documentation I figured out how to delete them, and I've got the disk space back. I think SafetyNet inadvertently was reenabled when I first got the Mac Studio and was setting it up afresh. I appreciate the insights on both Safe Mode and how modern Mac OS and CCC utilize disk space. Thanks very much.

System Data Partition Huge After Monterey Reinstall

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