+# operations used by Bacula:
+#
+# free (no arguments)
+# Scan the device and report the available space. It returns:
+# Prints on the first output line the free space available in bytes.
+# If an error occurs, prints a negative number (-errno), followed,
+# on the second line, by an error message.
+#
+# write op filename
+# Write a part file to disk.
+# This operation needs two additional arguments.
+# The first (op) indicates to
+# 0 -- append
+# 1 -- first write to a blank disk
+# 2 -- blank or truncate a disk
+#
+# The second is the filename to write
+#
+# operations available but not used by Bacula:
+#
+# test Scan the device and report the information found.
+# This operation needs no further arguments.
+# prepare Prepare a DVD+/-RW for being used by Bacula.
+# Note: This is only useful if you already have some
+# non-Bacula data on a medium, and you want to use
+# it with Bacula. Don't run this on blank media, it
+# is useless.