iMac has 1 TB SSD. There are four Finder root-level folders: Applications (Size 45 GB), Library (Size 21 GB), System (Size 19 GB), Users (Size 183 GB), a total of 268 GB. On the desktop Macintosh HD says 1 TB, 261 GB free. Activity Monitor says Swap Used: 281 MB.
Where did the other approximately 1000 - 268 - 261 = 471 GB go? Just curious, thanks.

diskutil list | grep "disk0\|disk1\|disk2\|disk3". You can post the output of the latter by piping the output topbcopy(append| pbcopyto the command). Then paste the result to the question with an [edit]. – Allan Jul 05 '23 at 20:15diskutil list | grep diskgives the same output and is much simpler. – lhf Jul 05 '23 at 20:16diskutil list | grep "disk[0..3]”would work equally as well. I should have used that. – Allan Jul 05 '23 at 20:21