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My /dev/sdb2 partition used up all it's space but the Used number is less than total Size of the partition in large number. I don't know what is happening.
How to check where was my missing 30Gb? enter image description here

Here is my inode table enter image description here

manaclan
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    [This question](https://askubuntu.com/q/48488) may be helpful. There are different ways that free space is estimated and reported. A variation of ± 5% is pretty normal. You're at around 3%. In addition to reporting discrepancies, in practice, hard drives need some free space overhead for the file system to function properly. Depending on circumstances this could be between 10% - 20%. Effectively, your disk really is too full and you should try to free up some more space. – Nmath Dec 09 '22 at 06:14
  • @Nmath tks, let me try remove some more used space – manaclan Dec 09 '22 at 06:16

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As @Nmath mentioned in the comment: A variation of ± 5% is pretty normal. You're at around 3%.
After removing some used space, the amount of Avail disk increased and everything was back to normal
enter image description here

manaclan
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