diff --git a/disk/disk_freebsd.go b/disk/disk_freebsd.go
index 9f95c62..8f4ede5 100644
--- a/disk/disk_freebsd.go
+++ b/disk/disk_freebsd.go
@@ -186,6 +186,9 @@ func SerialNumberWithContext(ctx context.Context, name string) (string, error) {
 			break
 		}
 	}
+	if err = s.Err(); err != nil {
+		return "", err
+	}
 	return serial, nil
 }