diff --git a/usr.sbin/bsdinstall/partedit/part_wizard.c b/usr.sbin/bsdinstall/partedit/part_wizard.c
--- a/usr.sbin/bsdinstall/partedit/part_wizard.c
+++ b/usr.sbin/bsdinstall/partedit/part_wizard.c
@@ -135,6 +135,16 @@
 					continue;
 				if (strncmp(pp->lg_name, "cd", 2) == 0)
 					continue;
+				/*
+				 * Check if the disk is available to be opened for
+				 * write operations, it helps prevent the USB
+				 * stick used to boot from being listed as an option
+				 */
+				fd = g_open(pp->lg_name, 1);
+				if (fd == -1) {
+					continue;
+				}
+				g_close(fd);
 
 				disks = realloc(disks, (++n)*sizeof(disks[0]));
 				disks[n-1].name = pp->lg_name;