In running a QNX 4.25 on a System  with A Dual Core Intel CPU E6400 2.13 Ghz.
I can install the Qnx software without any problem and the systems seems to run just fine.
However  when I tried to decompress .tar.F file of 200 Megs, I am getting an error during the process where it asks me 
to insert the next part of the archive.

I tested the archive was restorable on a different unit.
Checking the transfered file with cksum I discovered that the cksum utility is giving out a different cksum result each 
time it is ran on that large file.
The size reported of the file is however is matching exactly.

If I do a cksum on any other file I seem to be getting the proper result all the time.

We first suspected the 500 gb Sata drive and the latest Fsys.atapi driver so we redid the test with the same unit with a
 10 Gb EIDE drive.  runing Fsys.eide.  The result were the same.

We are not quite sure be we suspect that the Dual core CPU may be causing the issue but we are not to sure what should 
be tried.

has anyone experience and found any solution to any similar issue ?
Thanks