D34879.diff
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	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;