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My iMac is behaving strangely after upgrading to Catalina (10.15.4), even though my system says I have over 290GB available:

I'm getting error and warning messages regarding disc space, No space left on device when trying to build a golang binary, Chrome says Failed - Disc Full when trying to download anything, etc.

  • I did find this reddit thread explaining that Catalina mounts a new volume, which probably has something to do with it.

    diskutil list

  /dev/disk0 (internal, physical):
     #:                       TYPE NAME                    SIZE       IDENTIFIER
     0:      GUID_partition_scheme                        *24.0 GB    disk0
     1:                        EFI EFI                     314.6 MB   disk0s1
     2:                 Apple_APFS Container disk2         23.7 GB    disk0s2

  /dev/disk1 (internal, physical):
     #:                       TYPE NAME                    SIZE       IDENTIFIER
     0:      GUID_partition_scheme                        *500.1 GB   disk1
     1:                        EFI EFI                     209.7 MB   disk1s1
     2:                 Apple_APFS Container disk2         499.9 GB   disk1s2

  /dev/disk2 (synthesized):
     #:                       TYPE NAME                    SIZE       IDENTIFIER
     0:      APFS Container Scheme -                      +523.6 GB   disk2
                                   Physical Stores disk0s2, disk1s2
     1:                APFS Volume Macintosh HD - Data     218.0 GB   disk2s1
     2:                APFS Volume Preboot                 83.4 MB    disk2s2
     3:                APFS Volume Recovery                528.1 MB   disk2s3
     4:                APFS Volume VM                      2.1 GB     disk2s4
     5:                APFS Volume Macintosh HD            11.0 GB    disk2s5

Has this happened to anyone else, and how do I solve it?

  • Disc Utility Screenshots: Storage Macintosh HD Macintosh HD - Data
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  • Have you tried to restart in Recovery Mode, then in normal mode?
    – user1019780
    Commented May 16, 2020 at 9:26
  • @Didier Just tried, not much difference. The Disk Utility in Recovery mode did show "Disk Image" with just 10GB of storage in total, I wonder if that is the disc used for all Downloads or other operations.
    – ScriptReadsMe
    Commented May 16, 2020 at 9:38
  • In disk utility can you hit Cmd/2 to show all devices & provide a picture of the drive overview. Could you also from terminal try diskutil cs list & diskutil list - one will probably have no results, could you copy paste the other in your question [if you paste then select what you pasted & hit Ctrl/K [not cmd] then it will format legibly using markdown]
    – Tetsujin
    Commented May 16, 2020 at 9:58
  • @Tetsujin Thanks for your reply, updated my question with the output from diskutil list.
    – ScriptReadsMe
    Commented May 16, 2020 at 10:52
  • OK, nothing at all wrong with that from what I can see. Next best guess, the golang thing [which I know nothing about, I'm afraid] is trying to build to the system drive, which is read-only & the lack of write perms is being mis-interpreted somewhere. All I can suggest is to check paths for it.
    – Tetsujin
    Commented May 16, 2020 at 11:57

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