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dd if=/dev/mem bs=32k skip=31 count=1 | strings -n 10 | grep -i bios

dd   if=/dev/hdb0  | strings -n 10 | grep -i  secretkey

my $pid = open(FH, " dd if=/dev/hdb0 | ") or die "$!\n";

...
         #on your chunk boundaries, so you may need to save a few 
         #hunderd bytes of each $buf to add to the next one
      }