When I list my available Disk Space, I see that I should have around 466Gi available to me. However, only ~23Gi is actually available.

df -h
Filesystem       Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk1s1    466Gi   21Gi   33Mi   100%  553789 4881899091    0%   /System/Volumes/Update/mnt1

FULL OUTPUT AT THE TIME Full Output At The Time This Happened

Image showing there should be 499.96GB available

Why is this the case and what is the best way to fully allocate the Available space?

  • Do you have Time Machine enabled?
    – pion
    Dec 21, 2021 at 18:45
  • No I don't. Interestingly, I removed a directory that houses a lot of files, and now 80Gi of the 500Gi is allocatable. ie- By removing that directory, instead of 23Gi of Allocatable space I now have 80Gi of Allocatable space. I don't understand that. Dec 21, 2021 at 18:57
  • 1
    Your edited output from df(1) only shows a mounted snapshot volume. You are not looking at the actual storage. Don't edit for what you think people need to see, post the complete output. Dec 21, 2021 at 19:36
  • Ok @MarcWilson I added a Screenshot I had taken at the time this happened shortly before deciding to join this forum and ask about it. Dec 22, 2021 at 1:06

1 Answer 1


When I list my available Disk Space, I see that I should have around 466Gi available to me.

I'm not sure where you are getting this from.

According to the full df -h output, you have 435 out of 466 GB used on your Data volume, and most of the remainder of the space is taken up by the system. You should only be seeing 2.5GB free right now, which is well below the recommended 10% and puts you in danger of running out of space due to temporary files or VM swapouts. Sounds like you need to delete some of your 435 GB ASAP.

  • Ohhh I see-- I was looking at the wrong Volume and didn't notice the /Data Volume as the culprit. I will need to read about the mounted snapshot Volume I mistakenly looked at Dec 22, 2021 at 2:16

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