main.c

#include <stdio.h>

int main() {
  FILE *fp;
  int i;
  fp = fopen("\\\\.\\PhysicalDrive0", "r");
  for(i = 0; i < 10; i++) {
    printf("%x", (int)fgetc(fp));
  }
  return 0;
}

main.rs

use std::io::File;

fn main() {
  let mut r = File::open(&Path::new("\\\\.\\PhysicalDrive0");
  // r is now Ok(File{...})
  
  let b = r.read_u8();
  
  println!("{}", b);
  // Prints Err(unknown error (OS Error 87 (FormatMessageW() returned error 15100)))
}