diff --git a/sys/fs/udf/udf_strat_direct.c b/sys/fs/udf/udf_strat_direct.c
index 126fd307b16b..4299874c6a84 100644
--- a/sys/fs/udf/udf_strat_direct.c
+++ b/sys/fs/udf/udf_strat_direct.c
@@ -1,4 +1,4 @@
-/* $NetBSD: udf_strat_direct.c,v 1.5 2008/08/29 15:04:18 reinoud Exp $ */
+/* $NetBSD: udf_strat_direct.c,v 1.6 2008/11/28 15:29:47 reinoud Exp $ */
 
 /*
  * Copyright (c) 2006, 2008 Reinoud Zandijk
@@ -28,7 +28,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__KERNEL_RCSID(0, "$NetBSD: udf_strat_direct.c,v 1.5 2008/08/29 15:04:18 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: udf_strat_direct.c,v 1.6 2008/11/28 15:29:47 reinoud Exp $");
 #endif /* not lint */
 
 
@@ -278,7 +278,8 @@ udf_queue_buf_direct(struct udf_strat_args *args)
 	/* use disc sheduler */
 	class = ump->discinfo.mmc_class;
 	KASSERT((class == MMC_CLASS_UNKN) || (class == MMC_CLASS_DISC) ||
-		(ump->discinfo.mmc_cur & MMC_CAP_HW_DEFECTFREE));
+		(ump->discinfo.mmc_cur & MMC_CAP_HW_DEFECTFREE) ||
+		(ump->vfs_mountp->mnt_flag & MNT_RDONLY));
 
 	if (queue == UDF_SHED_READING) {
 		DPRINTF(SHEDULE, ("\nudf_issue_buf READ %p : sector %d type %d,"
diff --git a/sys/fs/udf/udf_subr.c b/sys/fs/udf/udf_subr.c
index e99039685090..32c8b8df69d2 100644
--- a/sys/fs/udf/udf_subr.c
+++ b/sys/fs/udf/udf_subr.c
@@ -1,4 +1,4 @@
-/* $NetBSD: udf_subr.c,v 1.74 2008/11/28 14:33:36 reinoud Exp $ */
+/* $NetBSD: udf_subr.c,v 1.75 2008/11/28 15:29:47 reinoud Exp $ */
 
 /*
  * Copyright (c) 2006, 2008 Reinoud Zandijk
@@ -29,7 +29,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__KERNEL_RCSID(0, "$NetBSD: udf_subr.c,v 1.74 2008/11/28 14:33:36 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: udf_subr.c,v 1.75 2008/11/28 15:29:47 reinoud Exp $");
 #endif /* not lint */
 
 
@@ -1991,6 +1991,12 @@ udf_process_vds(struct udf_mount *ump) {
 	if (n_spar)
 		ump->strategy = &udf_strat_rmw;
 
+#if 0
+	/* read-only access won't benefit from the other shedulers */
+	if (ump->vfs_mountp->mnt_flag & MNT_RDONLY)
+		ump->strategy = &udf_strat_direct;
+#endif
+
 	/* print results */
 	DPRINTF(VOLUMES, ("\tdata partition    %d\n", ump->data_part));
 	DPRINTF(VOLUMES, ("\t\talloc scheme %d\n", ump->vtop_alloc[ump->data_part]));