Ok. I do use UPSes. I have quite a number of them, one on every one of
my PCs, some quite large 2 UPS1400s, 2 UPS600s, 1UPS800, many more.

I understand. However, I have never, ever had such loss on other
systems. In my 20+ years of computing, Never has it happened. So you see
that this is extremely difficult for me to accept that this issue, one
that I can repeat reliably, is solely a HDD caching issue when it has
never happened on another of my systems.

I just preformed a test to try to duplicate the issue on the exact same 
hardware running Win XP. I copied some data (so as to have a backup) and then 
initiated a 3.5GB move from the main drive to the USB drive. Then I pulled the 
power when half-way through. Here are the reliable results from every time I 
preformed the test: 
File Loss on Source drive: NONE
File Loss on Dest drive: NONE
File Corruption on Source drive: NONE
File Corruption on Dest drive: 1 File corrupted: The file that was in progress 
when the power was pulled.

This tells me that you are incorrect in stating that it is not possible.
It is possible. Until I can do the same test with the same results with
an NTFS drive running on Linux, it's a bug to loose or corrupt data on
the source drive. Whose bug? I'm not sure.

-- 
file move causes data loss if interrupted due to system crash
https://bugs.launchpad.net/bugs/303610
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