🚀 go-pugleaf

I'm a little confused here.  I have compiled the same source under djgpp, and
Zortech C++, and am seeing vastly different results.  I am attempting to 
write directly to the disk with the fwrite function.  Under Gcc 
1.12.maint2 I get a max rate of about 35.8 kb/s when saving a 2MB file.  
With Zortech C++ v3, I get between 500 and 700 kb/s depending on the mode 
my HDD controller is in.

What am I doing wrong?  Thanks, Andy.

The source ....

#define NUM_KBYTES 2048
#define SIZE_OF_CHUNK 2048
#define CHUNKS (long unsigned int) NUM_KBYTES*1024/SIZE_OF_CHUNK

#include <stdio.h>
#include <time.h>      /* clock() */

void main()
{
  int i,index;
  char data[SIZE_OF_CHUNK];
  FILE *fptr;
  int bool;
  clock_t start,end;
  double diff;
  float rate;

  printf("Populating array ...\n");
  
  for (index=0; index <= SIZE_OF_CHUNK; index++) {
    data[index] = index;
    }
  
  printf("\nOpening file ...\n");
  fptr = fopen("test.dat", "w");
  
  printf("Filling file ...\n");

  if (fptr == NULL)+
    printf("File could not be opened\n");
  else {
    start=clock();

    /* Write CHUNKS*SIZE_OF_CHUNK bytes to file */
    for ( i=CHUNKS ; i > 0 ; i-- ) { 

      /* Write SIZE_OF_CHUNK single bytes to file */
      fwrite( &data, 1, SIZE_OF_CHUNK, fptr);
      
    }
    end=clock();

  }

  diff = (double) ( end - start ) / CLOCKS_PER_SEC;

  printf("Chunk size %d b \n", SIZE_OF_CHUNK );
  printf("Size of test %d kb \n", NUM_KBYTES );
  
  if (diff != 0) 
    rate = NUM_KBYTES / diff;
  else
    rate = 0;

  printf("Rate: %.1f kb/s \n", rate );

  fclose(fptr);
}