[k3b] [Bug 379268] Importing previous session does nothing (version 17.04.0)

[Thomas Schmitt]

https://bugs.kde.org/show_bug.cgi?id=379268

--- Comment #46 from Thomas Schmitt <scdbackup at gmx.net> ---
Hi,

Jonathan Riddell wrote:
> > Not having a CD drive or CD-Rs to test is quite a problem for the k3b
> > maintainer!

Leslie Zhai wrote:
> I think CDEmu is good enough for covering almost the general testcases,

We had those unclear failures with cdrskin and the emulator
in https://bugs.kde.org/show_bug.cgi?id=137436.
So i have to agree with Jonathan that you need a real burner drive for
development and testing.

Unlike me, you will probably not need more than one or two.
As backend programmer i always have to check with other drives when one
drive fails with unclear symptoms.
(I have to use them via /dev/sg instead of /dev/sr because of
  http://marc.info/?l=linux-scsi&m=135705061804384&w=2
)


> But multisession is a special testcase:
> * a big enough DVD/BlueRay disc, in this bug, Łukasz burn over 4+ GB video!

Łukasz experiences the problem here with DVD+R. I reproduced it rather by
unformatted DVD-RW, because this is the only medium type of DVD size which
does real multi-session and is re-usable. One has to be patient when it
comes to blanking.
Experiments with DVD+R or DVD-R would have sufficed, too, but would then
have produced lots of plastic waste.

DVD+RW, DVD-RAM, or formatted DVD-RW would not be suitable for exploring
true multi-session and the behavior of filesystem readers when they get to
see a real multi-session disc.


> * is general CD/DVD driver able to work for the BlueRay disc?

No. DVD drives only do DVD and CD. You'd need a drive which explicitely
promises to write BD media, e.g. by advertising write speeds for BD-R
and BD-RE media.
Beware of "combo" drives, which can read BD but write only DVD.

A SATA DVD burner costs about 15 EUR here, a SATA BD burner about 80 EUR.
The LG BH16NS55 BD burner is currently sold for about 60 EUR.
("Combo" drives cost as much as burner drives. So do not only look at
 the price tag.)

If rebooting your workstation would be a problem, it might be worth to
put the drive into a SATA-USB box with external power supply, even if you
have a full height drive slot free in your machine.
If the drive gets stuck during experiments then it can be easily reset
by switching power off and on. (This should not happen often with KDE
development, but is rather a risk with backend experiments. )
Empty USB boxes cost about 50 EUR. BD drives in USB box cost about 130 EUR.

You'd also need some CD-RW, DVD+RW, BD-RE media for experiments with
re-usable media, and probably a few BD-R for the occasions were real
multi-session on BD-R is desired.


Have a nice day :)

Thomas

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