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   From: "Allan"    
      
   On Sun, 28 Nov 2010 19:43:16 UTC, "Doug Bissett"  wrote:    
      
   > On Sun, 28 Nov 2010 12:31:26 UTC, Lars Erdmann    
   > wrote:   
   >    
   > > Doug Bissett wrote:   
   > > > On Sat, 27 Nov 2010 11:57:17 UTC, Lars Erdmann   
   > > >   
   > > > I am pretty sure that the BIOS is supposed to write good data through   
   > > > all of memory, even if you do the quick test.   
   > >    
   > > I don't think so. That's exactly what makes "Quick Power On self test"   
   > > quick. It does not write to all memory but only to a fraction (the fraction   
   > > used by DOS). You can tell the difference between writing and reading back   
   > > to only 640k or to the whole 2GB.   
   > >    
   > >    
   > > Lars   
   >    
   > No, that isn't right. A quick test simply writes all zeros, and reads    
   > it, then it writes all ones, and reads it, end of test, but at that    
   > point everything should be in good parity (the zero and one tests may    
   > be the other way around). An extended test does those two, then does    
   > half a dozen pattern writes, and reads before it is finished. Of    
   > course, different BIOS implementations might do it a little different.   
   > One thing, for sure, is that by the time an operating system gets    
   > booted, all of memory should be in good parity. If it is not, there is   
   > something wrong.   
   >    
      
   BIOS doesn't do RAM testing, if Quick boot is enabled, and that is the   
   standard of most PC's. The test/initialazation  it does when doing 'slow'    
   boot is quite useless. I've had many bad RAM's over the years - and almost   
   always run in the slow boot mode - but BIOS have never complained, where   
   Memtest have found many problems in RAM, when such test is run.   
      
   It is actually a job for the OS, to initialise RAM, to be sure it is setup as   
   expected.   
   OS4LDR have implemented this feature - to 0 all cells at init.   
      
   Try it....   
      
      
   --    
     Allan.   
      
   It is better to close your mouth, and look like a fool,   
   than to open it, and remove all doubt.   
      
   --- Internet Rex 2.31   
    * Origin: Datemas.de http://www.news.datemas.de (1:261/20.999)