Add section .data

src/x86/linker.ld

@@ -19,5 +19,10 @@ SECTIONS
         *(.rodata);
     }
 
+    .data : ALIGN(4)
+    {
+        *(.data);
+    }
+
     program_end = .;
 }

src/x86/stage1.S

@@ -9,7 +9,6 @@
 .global _start
 
 .section .rodata
-disk: .byte 0
 newline: .string "\r\n"
 hello: .string "Hello from stage 1!\r\n"
 size_str: .string "Stage 2 size: "
@@ -19,6 +18,9 @@ parenth: .string " ("
 of: .string " of "
 to_address: .string ") to address "
 
+.section .data
+disk: .byte 0
+
 .section .text
 _start:
     mov %dl, disk