diff --git a/installer/kayak-menu b/installer/kayak-menu
index d571a32..1d23e27 100755
--- a/installer/kayak-menu
+++ b/installer/kayak-menu
@@ -45,6 +45,7 @@ if [ $debug -eq 0 ]; then
 	echo
 	echo "Scanning for media..."
 	mkdir /.cdrom
+	mkdir /.usbdrive
 	/kayak/bin/mount_media $VERSION
 fi
 
diff --git a/src/mount_media.c b/src/mount_media.c
index 8ee8d38..1e03050 100644
--- a/src/mount_media.c
+++ b/src/mount_media.c
@@ -40,6 +40,7 @@
 #include <fcntl.h>
 #include <libdevinfo.h>
 #include <limits.h>
+#include <fts.h>
 #include <sys/sunddi.h>
 #include <sys/types.h>
 #include <sys/dkio.h>
@@ -48,6 +49,7 @@
 
 #define	HSFS_OPTS	"ro"
 #define	UFS_OPTS	"ro,nologging,noatime"
+#define	PCFS_OPTS	"ro"
 
 static boolean_t mounted = B_FALSE;
 static boolean_t verbose = B_FALSE;
@@ -76,13 +78,106 @@ check_volsetid(const char *volid)
 	return (ret);
 }
 
+/*
+ * Mounts and tests supplied path to iso file for supplied volid
+ * Returns 0 if volid found, -1 otherwise.
+ */
+static int
+test_iso_file(const char *path, const char *volid)
+{
+	int ret = -1;
+	char opts[MAX_MNTOPT_STR];
+
+	strcpy(opts, HSFS_OPTS);
+	if (verbose)
+		printf("%s: mount hsfs (iso)\n", path);
+	if (mount(path, "/.cdrom", MS_RDONLY | MS_OPTIONSTR,
+		"hsfs", NULL, 0, opts, sizeof (opts)) != 0)
+		return (ret); /* mount failed */
+
+	/* Mounted, see if it's the image we're looking for, unmount if not */
+	ret = check_volsetid(volid);
+	if (ret != 0) {
+		if (verbose)
+			printf("%s: wrong ID, unmounting\n", path);
+		(void) umount("/.cdrom");
+	}
+	return (ret);
+}
+
+/*
+ * Attempt to mount the path as pcfs. Then walk the file tree
+ * and look for any iso files.
+ * For every one found, mount it and check for volid
+ * and umount if failed. return's 0 if the right iso is found
+ * and -1 otherwise.
+ */
+static int
+check_for_iso(const char *path, const char *volid)
+{
+	int ret = -1;
+	char opts[MAX_MNTOPT_STR];
+
+	strcpy(opts, PCFS_OPTS);
+	if (verbose)
+		printf("%s: mount PCFS\n", path);
+	if (mount(path, "/.usbdrive", MS_RDONLY | MS_OPTIONSTR,
+	    "pcfs", NULL, 0, opts, sizeof (opts)) != 0) {
+		return (ret); /* mount failed */
+	} else {
+		/* mount succeeded, look for iso files */
+		FTS *tree;
+		FTSENT *f;
+		char *pathtowalk[] = { "/.usbdrive", NULL };
+
+		tree = fts_open(pathtowalk, FTS_LOGICAL | FTS_NOSTAT, NULL);
+		if (tree == 0) {
+			if (verbose)
+				printf("%s: fts_open failed\n", path);
+			return (ret); /* traverse failed */
+		}
+
+		while ((f = fts_read(tree)) != 0) {
+			if (f->fts_info != FTS_F) /* regular file */
+				continue;
+
+			if (f->fts_namelen > 4 &&
+			    (strcasecmp(".iso",
+			    f->fts_name + f->fts_namelen - 4) == 0)) {
+				if (verbose)
+					printf("iso found: %s\n", f->fts_name);
+
+				ret = test_iso_file(f->fts_path, volid);
+				if (ret == 0)
+					break; /* correct iso found */
+			}
+		}
+
+		if (fts_close(tree) < 0)
+			if (verbose)
+				printf("error closing tree\n");
+
+		if (ret != 0) {
+			if (verbose)
+				printf("%s: wrong volume, unmounting\n", path);
+			(void) umount("/.usbdrive");
+			/* if ret==0 we do not unmount the usbdrive mount */
+		}
+	}
+
+	return (ret);
+}
+
 static int
 mount_image(const char *path, const char *volid)
 {
 	int ret = -1;
 	char opts[MAX_MNTOPT_STR];
 
-	/* First try mounting it as hsfs; if that fails, try ufs */
+	/*
+	 * First try mounting it as hsfs; if that fails, try ufs; if
+	 * that fails try check_for_iso()
+	 */
 	strcpy(opts, HSFS_OPTS);
 	if (verbose)
 		printf("%s: mount HSFS\n", path);
@@ -93,7 +188,8 @@ mount_image(const char *path, const char *volid)
 			printf("%s: mount UFS\n", path);
 		if (mount(path, "/.cdrom", MS_OPTIONSTR, "ufs", NULL, 0,
 		    opts, sizeof (opts)) != 0)
-			return (ret);
+			if (check_for_iso(path, volid) != 0)
+				return (ret);
 	}
 
 	if (verbose)