dd question (from man page)

jd1008 jd1008 at gmail.com
Mon Nov 17 19:28:46 UTC 2014

Man page says:

               physically write output file data before finishing

        fsync  likewise, but also write metadata

There is no explanation about this, as dd is supposed to be agnostic
about the type of the data.

If a disk is being dd'ed  out to a file and the disk is mounted,
(which is a BAAAAD thing to do), then even there, dd is agnostic
about FS data and FS metadata.

So, what data and metadata is the manpage talking about?

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