diff --git a/src/arch/i386/interface/pcbios/int13.c b/src/arch/i386/interface/pcbios/int13.c
index c491bf88..1d973e77 100644
--- a/src/arch/i386/interface/pcbios/int13.c
+++ b/src/arch/i386/interface/pcbios/int13.c
@@ -368,6 +368,8 @@ static int int13_guess_geometry ( struct int13_drive *int13 ) {
 		       int13->drive, strerror ( rc ) );
 		return rc;
 	}
+	DBGC2 ( int13, "INT13 drive %02x has MBR:\n", int13->drive );
+	DBGC2_HDA ( int13, 0, &mbr, sizeof ( mbr ) );
 	DBGC ( int13, "INT13 drive %02x has signature %08x\n",
 	       int13->drive, mbr.signature );