OmniDiskSweeper will also over-count disk usage on APFS file systems, especially if you have a lot of mostly unchanged file/folder copies, this is due to APFS "copy on write" feature, where copies are just filesystem "references" until they are modified, at which point full copies sre created. Note that OmniDiskSweeper will not see APFS snapshots (they are not regular files). It might possibly help to give it "Full Disk Access" in System Preferences > Security & Privacy > Privacy. I've tried scanning with Omnidisk too, but the files it finds don't add up to the amount of used space. You might also want to disable "CCC Snapshots" (for the local HD) so that you avoid this issue in the future. To get rid of them right click on them in CCC and delete them, you may need to unmount them first. If your using Carbon Copy Cloner check if the local HD is set to use "CCC Snapshots". In fact, deleting many gigabytes of data doesn't seem to create space on the disk. Will the registered version of DaisyDisk give me access to these invalid snapshots so I can remove them? Click on Scan and let Grand Perspective do its. Repairing storage systemPerforming fsck_apfs -y -x /dev/disk0s2Checking the container superblock.Checking the EFI jumpstart record.Checking the space manager.Checking the space manager free queue trees.Checking the object map.Checking volume.Checking the APFS volume superblock.The volume Macintosh HD - Data was formatted by newfs_apfs (748.77.8) and last modified by apfs_kext (1412.61.1).Checking the object map.Checking the snapshot metadata tree.Checking the snapshot metadata.Checking snapshot 1 of 2 (.14d7a6)error: btn: invalid key (64, 8200)Snapshot is invalid.The volume /dev/disk0s2 could not be verified completely.Storage system check exit code is 0. For the whole drive, navigate up the file system with the pop-up menu at the top to your Macintosh HD, or whatever you’ve named your hard drive. Happy to do that if it's the shortest path to solving this problem, but I also ran Disk Utility's First Aid in recovery mode. So unlike other apps that only show the top few largest files. Thanks so much for this u/richar_d! I got DaisyDisk and ran it, but the files were still hidden and I needed to get a license to reveal them. When I run GrandPerspective on a great grandfather folder with a huge family tree. If First Aid detects any errors, then copy its whole log to the clipboard, and then use Safari to upload it somewhere such as dpaste.Choose File → Run First Aid… from the menubar. ![]() If there is no container, and you're using macOS 10.13 (High Sierra) or later, then it's time to panic. Select the container of a/the Macintosh HD volume in the left pane.Press command-2 to show devices, containers, and volumes.Follow the instructions if you're prompted to authenticate.Note: First Aid will probably take at least 15 minutes to complete. I recommend that you scan them for errors by doing the following: ![]() Secondly, it's possible that one of the system volumes or their container is corrupted. Firstly, I strongly recommend using DaisyDisk because it can account for intangible used space such as that occupied by other volumes or immutable system files.
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