-char *device[MAX_DEVICES]; /* the block device to use */
-int erasesz[MAX_DEVICES]; /* optional default erase size */
-int ro[MAX_DEVICES]; /* optional read only flag */
-int sync;
+static char *device[MAX_DEVICES]; /* the block device to use */
+static int erasesz[MAX_DEVICES]; /* optional default erase size */
+static int ro[MAX_DEVICES]; /* optional read only flag */
+static int sync;