Changed prescription for safe loading of tray before xorrisofs add-on session

xorriso/xorrisofs.1

@@ -9,7 +9,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH XORRISOFS 1 "Version 1.5.1, Oct 08, 2018"
+.TH XORRISOFS 1 "Version 1.5.1, Nov 11, 2018"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -194,11 +194,7 @@ on the intended medium.
 .br
 Both values can be inquired from optical media by help of burn programs
 and cdrecord option \-msinfo. xorriso itself can obtain it in its
-cdrecord emulation. Do not let it load the drive, but rather do this manually
-or by a program like dd which reads a few bytes. Only then it is sure that
-the device driver knows the true readable size of the medium.
-.br
-  dd if=/dev/... count=1 >/dev/null 2>&1
+cdrecord emulation.
 .br
   values=$(xorriso \-as cdrecord dev=/dev/... \-msinfo)
 .br
@@ -1737,11 +1733,12 @@ The first session is written like this:
 .br
     | xorriso \-as cdrecord \-v dev=/dev/sr0 blank=fast \-multi \-eject \- 
 .br
-Follow\-up sessions are written like this:
-.br
-  $ dd if=/dev/sr0 count=1 >/dev/null 2>&1
+Follow\-up sessions are written like this (the run of dd is only to give demons
+a chance to spoil it):
 .br
   $ m=$(xorriso \-as cdrecord dev=/dev/sr0 \-msinfo)
+.br
+  $ dd if=/dev/sr0 count=1 >/dev/null 2>&1
 .br
   $ xorrisofs \-M /dev/sr0 \-C $m \-graft\-points \\
 .br
@@ -1749,14 +1746,25 @@ Follow\-up sessions are written like this:
 .br
     | xorriso \-as cdrecord \-v dev=/dev/sr0 \-waiti \-multi \-eject \-
 .br
-Always eject the drive tray between sessions. The old sessions
-get read via /dev/sr0. Its device driver might not be aware
-of the changed content before it loads the medium again.
-In this case the previous session would not be loaded and the
-new session would contain only the newly added files.
+Always eject the drive tray between sessions.
 .br
-For the same reason do not let xorriso \-as cdrecord load the medium,
-but rather do this manually or by a program that reads from /dev/sr0.
+The run of xorriso \-as mkisofs will read old sessions via the CD\-ROM
+driver of /dev/sr0. This driver might not be aware of the changed content
+as long as the medium is not loaded again. In this case the previous session
+would not be properly assessed by xorriso and the new session would contain
+only the newly added files.
+.br
+Some systems have not enough patience with automatic tray loading and some
+demons may interfere with a first CD\-ROM driver read attempt from a freshly
+loaded medium.
+.br
+When loading the tray manually, wait 10 seconds after the drive has stopped
+blinking.
+.br
+A safe automatic way seems to be a separate run of xorriso for loading
+the tray with proper waiting, and a subsequent run of dd which shall offer
+itself to any problems caused by demons assessing the changed drive status.
+If this does not help, insert a run of "sleep 10" between xorriso and dd.
 .SS
 .B Let xorrisofs work underneath growisofs
 growisofs expects an ISO formatter program which understands options \-C and
@@ -1809,12 +1817,13 @@ the two disk trees to the medium is desired. Begin with a blank medium and
 update it until he run fails gracefully due to lack of remaining space on
 the old one.
 .br
-Do not let xorriso \-as cdrecord load the medium,
-but rather do this manually or by a program that reads from /dev/sr0.
-.br
-  $ dd if=/dev/sr0 count=1 >/dev/null 2>&1
+Always eject the drive tray between sessions.
+A run of dd shall give demons a chance to spoil the first read on freshly
+loaded media.
 .br
   $ msinfo=$(xorriso \-as cdrecord dev=/dev/sr0 \-msinfo)
+.br
+  $ dd if=/dev/sr0 count=1 >/dev/null 2>&1
 .br
   $ load_opts=
 .br
@@ -1909,12 +1918,13 @@ With the first session:
 With the second session, option \-old\-root refers to /session1 and the
 new \-root is /session2.
 .br
-Do not let xorriso \-as cdrecord load the medium,
-but rather do this manually or by a program that reads from /dev/sr0.
-.br
-  $ dd if=/dev/sr0 count=1 >/dev/null 2>&1
+Always eject the drive tray between sessions.
+A run of dd shall give demons a chance to spoil the first read on freshly
+loaded media.
 .br
   $ msinfo=$(xorriso \-as cdrecord dev=/dev/sr0 \-msinfo)
+.br
+  $ dd if=/dev/sr0 count=1 >/dev/null 2>&1
 .br
   $ load_opts=
 .br