https://bugs.kde.org/show_bug.cgi?id=513270
Bug ID: 513270
Summary: FEATURE: Please add support for actual BluRay burn
speed selection (ie: allow disabling growisofs BluRay
defect remapping)
Classification: Applications
Product: k3b
Version First unspecified
Reported In:
Platform: unspecified
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: GUI/Usability
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
Problem:
By default, there is no way for k3b to select the burn speed when burning any
BluRay disc.
Why?
Because:
- growisofs is the default back-end burning program
- growisofs automatically and silently always turns on (otherwise never used by
any other burning software) BluRay's automatic media defect detection and
remapping system. This defect remapping limits all burns to no more than 1.6x,
which for a BD100, takes on the order of four hours, and the better part of six
hours for a BD128.
The sole method to make growisofs honor the command line's explicit speed
setting is to use the undocumented (and criminally tacky) switch
"-use-the-force-luke=spare:none" to turn off creating a media defect remapping
spare area.
Request k3b adopt one of the following fixes:
No-UI-change options:
- Simply add "-use-the-force-luke=spare:none" to every BD burn. The automatic
media refect remapping is not something any other burning program uses, and
there is likely no expectation for its presence by any user. Indeed, the
question I see is "why can't growisofs set the burning speed" and the normal
reply is "because it's Linux and optical has never worked right there".
- OR, by default populate "-use-the-force-luke=spare:none" in
Settings->K3b->Progams->User Parameters, so that any user sufficiently
insistent on needlessly wasting time on burns can still remove the switch if
desired.
- If k3b is too risk averse for that, then add add the magic switch when the
speed is set by the user to anything other than 2x manually (ie: leave it when
speed is set to auto, or 2x, but turn off auto-remapping when the speed is
explicitly set to 4x or above)
- OR, another no-UI option is to include the undocumented switch whenever
"Verify written data" is NOT turned on. Or, in other words, use "Verify
written data" on a BluRay as a synonym for engaging spare area
formatting/automatic defect remapping. I favour this approach, if and ONLY if
the user is presented with a warning informing them of the ramifications when
turning it on.
UI-change:
- Lastly, the most visible fix is to create a UI checkbox that allows the user
to turn it on or off explicitly.
Workaround:
The workaround exists, of course, for the user to add the tacky switch manually
to Settings->K3b->Progams->User Parameters
Why Workaround is Insufficient:
- The workaround is undocumented
- The official web site that even mentions it has gone dark.
https://web.archive.org/web/20250318102426/http://fy.chalmers.se/~appro/linux/DVD+RW/Blu-ray/
- The expectation should not be that the user must dig into arcane undocumented
switches or back-end source code to get the program to operate as advertised.
- The feature in question is of dubious utility, not widely used anywhere, and
represents "helicopter parenting" of the user on the part of programs, which is
an anathema to the entire Unix philosophy.
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