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Why is my filesystem size larger than the partition size. (df vs fdisk)

br flag

So... I get that fdisk lists partition sizes, and df lists filesystem sizes, and that filesystem may use a portion of the partition and disagree on the size, but why would df list filesystem sizes that are larger that the partition sizes?

enter image description here

df: /dev/sda6 200G

fdisk: /dev/sda5 7.8G

Wut?

cc flag
sda6 seems to be mounted in two different places, / and /home -- that probably confuses things.
br flag
Perhaps related to btrfs? (which I don't have a full understanding of).
mx flag
fdisk seems to be wrong: the total size of the disk is displayed as 12 GiB, which seems very small for nowadays disks. The sector size of 512 bytes seems strange: nowadays we see often 4096 bytes or sometimes more. Perhaps you can try other programs like parted or cfdisk.
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