Hard reset per @Freax13's request

Author: kennystrawnmusic

src/fat.rs

@@ -26,7 +26,7 @@ pub fn create_fat_filesystem(
         .truncate(true)
         .open(out_fat_path)
         .unwrap();
-    let fat_size_padded_and_rounded = ((needed_size + 1024 * 64 - 1) / MB + 1) * MB;
+    let fat_size_padded_and_rounded = (((needed_size + 1024 * 64 - 1) / MB + 1) * MB) + MB;
     fat_file.set_len(fat_size_padded_and_rounded).unwrap();
 
     // choose a file system label