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Tag : disk-usage  
Link: 🔍 See Original Answer on Ask Ubuntu 🔗

Title: What is the available space on my disk, exactly
ID: /2020/06/01/What-is-the-available-space-on-my-disk_-exactly
Created: June 1, 2020
Upload: November 24, 2022    Layout:  post
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QDirStat appears to be only showing the size of files you own. For example /boot shows as zero bytes but in reality it would have to have something in it:

For example:

$ du /boot -s -h

du: cannot read directory '/boot/efi': Permission denied
1.2G	/boot

$ sudo du /boot -s -h
1.3G	/boot

Another important consideration is some utilities list the size of the bytes in a file while others list the space a file occupies which is number of bytes rounded up to the block size which is generally 4,096 bytes or 4K.

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