volume locking

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Hi,

I am involved in a project that has to be able to erase the existence of
data from the file system. This requires going in to the underlying file
system structures and writing to them. It seems to me that there must be
some way of obtaining exclusive write access to the entire volume...
preventing the operating system from potentially attempting to use the space
that we are in the middle of clearing... also, it would seem that as a
preventative measure, we would want the write cache flushed before we do
this... in the (hopefully) rare case that the OS has written to the
location, but the write has not yet been flushed to disk. Lastly, is there
a way to lock just the portion of the volume to which we intend to write?
If so, that would seem to be the best option, wouldn't it? We would like to
be able to do this for both 9x systems and NT systems... but NT systems are
the higher priority...


Thank you in advance for any help,
Chris


.

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