Thanks for the explanation, Szabolcs.

I can't remember the exact details now of course, but I do remember that
the 'dd' copy from USB to /dev/sda2 had finished when I spotted the CPU
monitor showing the I/O wait.

I hadn't spotted mount.ntfs in the process list previously, although
admittedly I'd never been looking for it. I tend to be looking at top or
"ps -ef | grep ..." output much of the time.

I'm wondering if what I saw was the results of the 'dd' copy failing
because the USB device had an error. I didn't notice any dd error since
I'd had that running in the background because it takes a while - I'd
gone off to do others things.

>From your explanation it looks like my linkage of the issue with
mount.ntfs was a result of coincidence.

Since I can't reproduce it I'll mark the report invalid. Thanks for your
input.

** Changed in: ntfs-3g (Ubuntu)
       Status: New => Invalid

-- 
mount.ntfs causes 100% CPU (iowait)
https://bugs.launchpad.net/bugs/328352
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