dd question (from man page)

Robert Nichols rnicholsNOSPAM at comcast.net
Tue Nov 18 15:38:37 UTC 2014

On 11/17/2014 01:28 PM, jd1008 wrote:
> Man page says:
> ...
>         fdatasync
>                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?

When the output from dd is going to _file_, the filesystem that
holds that file will have metadata for it.

Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.

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