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blockdevcan return three types of block sizes with different values. Andgrep -H . /sys/class/block/sda/queue/*_{block,io}_sizeshows the same 4 different types printed byfdisk. Is your question "Why is there a difference between these two commands?" Is it "how can I see the block size used to allocate space on my filesystem?" Are you looking into something different from space allocation?fdisk?" So you can see there's a number of different questions you might have in mind.