> The setting was wrong. It was mistake and I changed forced write to ON.
> Is forced write setting only IB/FB cache matter or switch off OS file
> cache too?

The problem with Windows ( I believe all versions? ) is that
there is no 'write through' caching, so that it is windows
that is holding live data in memory and not also updating
the disk copy until told. And even when it is told to save
to disk it does not always to it. Only when something is
closed does the actual copy to disk take place. ForcedWrite
makes sure that the disk copy matches the memory copy at a
performance penelty, but it is WINDOWS that actually has the
fundamental problem. Hence a lot of people prefer Linux for
secure applications. ( Or duplicate across multiple machines )

--
Lester Caine
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L.S.Caine Electronic Services