diff -ur bonnie++-1.03a/bonnie++.cpp bonnie++-1.03a-urand/bonnie++.cpp
--- bonnie++-1.03a/bonnie++.cpp	2002-12-04 00:40:35.000000000 +1100
+++ bonnie++-1.03a-urand/bonnie++.cpp	2007-01-01 13:03:41.644378000 +1100
@@ -41,6 +41,9 @@
 #include <string.h>
 #include <sys/utsname.h>
 #include <signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 #ifdef AIX_MEM_SIZE
 #include <cf.h>
@@ -148,6 +151,28 @@
   }
 }
 
+void load_random_data(char *temp_buffer,int length)
+{
+	int filedes, numbytes;
+
+	filedes=open("/dev/urandom",O_RDONLY);
+	if(filedes<0)
+	{
+		perror("Open of /dev/urandom failed, falling back to 0's");
+		memset(temp_buffer, 0, length);
+	}
+	else
+	{
+		numbytes=read(filedes,temp_buffer,length);
+		if(numbytes!=length)
+			{
+				perror("Read from /dev/urandom failed, falling back to 0's");
+				memset(temp_buffer, 0, length);
+			}
+		close(filedes);
+	}
+}
+
 int main(int argc, char *argv[])
 {
   int    file_size = DefaultFileSize;
@@ -477,7 +502,8 @@
       return 1;
     globals.decrement_and_wait(FastWrite);
     if(!globals.quiet) fprintf(stderr, "Writing intelligently...");
-    memset(buf, 0, globals.chunk_size());
+    // memset(buf, 0, globals.chunk_size());
+    load_random_data(buf, globals.chunk_size());
     globals.timer.timestamp();
     bufindex = 0;
     // for the number of chunks of file data