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    like this, the ncdu output is meaningless for your problem, because it counts the data on other filesystems in your /. If anything, run ncdu -x /, and replace your ncdu output with the output of that :) afterwards, your /mnt should count 0! That is, unless you have files in there that do not actually reside on a different file system but your nvme0n1p2 Commented Jan 7, 2024 at 14:47
  • in any case, you'd clearly want to navigate in ncdu's UI into the /mnt directory and look what's happening there. Commented Jan 7, 2024 at 14:53
  • This looks disconcertingly similar to What's using all the space on a seemingly empty partition? Commented Jan 7, 2024 at 17:07
  • @MarcusMüller I'm not worried about /mnt, which is connected to 2 folders on an NAS via nfs. I am beginning to wonder whether the main drive - nvme0n1p2 - is clogged with 900GB of metadata on the 14TB of videos in those two folders, but (a) I have no idea whether it's realistic for the metadata to be that big; (b) I feel like it shouldn't be that big because that would make NAS's unworkable; and (c) no idea how to fix it if so. Commented Jan 7, 2024 at 17:28
  • In any case, though, # ncdu -x / does take /mnt down to zero, but my problem remains, which is that ncdu accounts for about 40 GB on a 1 TB drive that df thinks is 98% full. Commented Jan 7, 2024 at 17:30