Missing ~10GB of disk space after upgrading

[jayhawk1941]

I searched the forums prior to asking, so please forgive me if this has already been addressed and I just missed it.

I had ~103GB of available storage space on my Mac prior to upgrading to Catalina and am now at ~93GB after upgrading. I'm trying to figure out where the space went. 10GB may not seem like such a big deal, but on a 250GB hard drive every bit of storage is necessary.

I've used DaisyDisk but don't notice anything out of the ordinary. Does anyone have any idea where this could be? I know that the Catalina upgrade was about 8.5GBs. Is this update file automatically trashed and deleted after the update?

Thanks for your help!

 

[lemonkid]

Yes the mysterious disc space wizard has attacked once more after upgrading to this modern day MacOs. I am 44GB short. Which is mentioned as 'deletable' for some strange reason. I can use it but... it first must be deleted? What?

I remember that years ago the mysterious disc space wizard also attacked my disc. Then it was some weird local TimeMachine backup that for reasons that I can understand was created when your laptop was not connected to a backup drive. But after reconnection the backup would not delete itself as it should do.

So could it be that this is the same kind of Apple Wonder Work? I already disabled TimeMachine and restarted my laptop. The free space then grew with 4GB and the deletable space shrunk with 4GB. But that was all. Now I still have 44GB deletable space.

 

[lemonkid]

About Time Machine local snapshots - Apple Support

Time Machine lets you restore files from local snapshots of the files on your Mac, even when your Time Machine backup disk isn't available.

support.apple.com

Try this!

 

[lemonkid]

I tried and it works. Keep in mind that after the update about 10 GB is reserved for your systemsoftware. MacOs 10.15 creates a Read Only Disc. On that partition Catalina is installed and no other app can use that partition. This to prevent malicious apps hijacking your system.