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oneat@oneat-desktop:~$ sudo tune2fs -c 1 /dev/sda
tune2fs 1.41.11 (14-Mar-2010)
tune2fs: Bad magic number in super-block while trying to open /dev/sda
Couldn't find valid filesystem superblock.

Why this error occurred ?

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right - use 'sudo tune2fs -c 1 /dev/sda2' or 'sudo tune2fs -c 1 /dev/sda5' or similar.

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Because I put disk instead of partition.

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