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Re: [Bug-xorriso] To Thomas Schmitt: how to go on, xorriso is installed

From: Thomas Schmitt
Subject: Re: [Bug-xorriso] To Thomas Schmitt: how to go on, xorriso is installed
Date: Tue, 16 Apr 2019 19:45:42 +0200


Adalbert Han├čen wrote:
> The old directories were shown as ampty in Thunar, which is ok.

Hrmpf. I should have advised you to use

  -rm_r /home --

after the -mv command.

(And a -volid command to override the default Volume Id "ISOIMAGE".)

> Written to medium : 300 sectors at LBA 128183

That's the minimum size of a CD session. The size needed for a new
superblock and directory tree was even smaller. (The Spring Snowflake
image data were not written again.)

> ISO session : 1 , 0 , 116633s , ISOIMAGE
> ISO session : 2 , 128183 , 38s , ISOIMAGE

Much more than 600 KiB were wasted by the hardware. 22 MiB gap between
the sessions.

You may still mount the older session:

  mount -o sbsector=0 /dev/sr0 /your/mount/directory

and, after you added more sessions, the second one by

  mount -o sbsector=128183 /dev/sr0 /your/mount/directory

(Linux mount understands -o session=2 with CD, but not with DVD.)

> Media summary: 2 sessions, 117085 data blocks, 229m data, 438m free

The next gap will be smaller, according to the predicted Next Writable
Address (drive's idea, not mine):

> Media nwa : 135385s

   135385 - 128183 - 38 = 7164 = 14 MiB

So one should bundle changes in the same session. I.e. next time you
add more images, you may apply above -rm_r to get rid of the empty
directory chain.

> My wife has a T410 computer running Xubuntu too. However I'll have to
> install xorriso first to find out what CD/DVD-device is in it and then we
> can decide if it would give us any further information to try stream
> recording there.

Its announcement will be in the reply to the last GET CONFIGURATION
command in the output of

  xorriso -scsi_log on -outdev /dev/sr0

when a (still) writable CD-R is inserted.

But there is no need to endanger more CD-Rs by Stream Recording.
I know already that there are dishonest drives around.
So just make always sure that the Xfburn feature is disabled and that
you do not enable it in xorriso runs.

If you can get your hands on a DVD-RAM, then it would become interesting
again. It's the only DVD medium where Stream Recording brings benefits.
But don't buy one. They are not worth the money.

The original reason why i implemented Stream Recording was to get full
2x speed out of BD-RE media. 9 MiB/s is slow enough for a medium with
23098 MiB of capacity. Other than its ancestor DVD-RAM, the BD-RE
media type is about the best re-usable one of all.

Have a nice day :)


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