> You are making a file containing just zeroes, and ext2fs is making a
> sparse file for you. A sparse file can be written at close to main
> memory speed, I would guess. There should not be much disk activity.
> Try /dev/urandom next time...
No, ext2fs only creates holes when you seek() over the relevant
blocks, which dd doesn't do; dd-ing from /dev/zero is a fast, reliable
way to create a file taking up as many real blocks as you wish. At
any rate, /dev/urandom has its own overhead, which would complicate
the issue.
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