Re: Status of UDF CD packet writing?

From: Jens Axboe (
Date: Wed Oct 09 2002 - 05:45:37 EST

On Wed, Oct 09 2002, lell02 wrote:
> >On Tue, Oct 08 2002, lell02 wrote:
> >> hi,
> >>
> >> >Will Jens Axboes patch for CD packet writing for CD-R/RW make it in
> >> >before the feature freeze? I know Jens Axboe is busy with more basic I/O
> >> >stuff, but i sincerely hope it can be squeezed in before 2.6/3.0 is
> >> >released.
> >>
> >> jens stated on this about 1-2 days ago. he said, it would be little
> >> modification on the ide-cdrom, to make it work with cd-mrw/ packet
> >> writing. so it could go in after the feature freeze.
> >
> >You might be talking about two different patches -- one for cd-rw
> >support (this is the pktcdvd (or -packet) patch that Peter Osterlund has
> >been maintaining) and the other for cd-mrw. The cd-mrw patch is very
> >small, not a lot is required to support that in the cd driver.
> >Supporting cd-rw is a lot harder, basically you have to do in software
> >what cd-mrw does in hardware (defect management, read-modify-write
> >packet gathering, etc).
> >
> >cd-mrw will definitely be in 2.6. cd-rw support maybe, I haven't even
> >looked at that lately.
> >
> thanx for clearing out these differences.
> but, isn't cd-mrw supposed to replace the old packet-writing
> technique? so, in the end, there wouldn't be any need for
> packet-writing, if every burner ships with cd-mrw-support... i read in
> the "specs", that the technology would be much better.

(btw, please break your lines at 72 chars or similar)

Yeah that is true, the need for the cd-rw packet writing patch should
diminish once cd-mrw is in all drives.

Jens Axboe

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