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SubjectFw: failure to burn CDs under 2.4.0-test9
Date

----- Original Message -----
From: "J. Dow" <jdow@earthlink.net>
To: "Andre Hedrick" <andre@linux-ide.org>
Sent: Friday, October 06, 2000 0:35
Subject: Re: failure to burn CDs under 2.4.0-test9


> From: "Andre Hedrick" <andre@linux-ide.org>
>
> > On Thu, 5 Oct 2000, J. Dow wrote:
> >
> > > For that matter Andre a 4 speed HP can certainly burn at 4 speed except
> > > that cdrecord and the OS conspire to prevent this through a mathematical
> > > error. It's rather a tad frustrating.
> >
> > Explain, please
>
> I skipped all the mkisofs stuff. I downloaded the 7.0 images and tried to
> burn them to CDROM on CDs rated for 6 speed and a drive, HP CDWriter+ 8100,
> rated for 4 speed on write. The system is an Athlon 700MHz with a K7M
> board. The CDWriter+ is IDE. The OS at the time was the -22 build from
> RedHat's pinstripe/.../preview directory recompiled in an attempt to
> make the via82cxxx_audio work. (It works right under 2.4.0-test8 I am
> running now.)
>
> > cdrecord -v speed=4 dev=0,0,0 -eject -data $ISO9660_PATH/cd_image
>
> Remarkably similar to the command I used. It still burned at 2 speed. I
> traced through the cdrecord code and three levels of OS driver finding
> several conversions from nominal speed ratings to "precise" speed ratings.
> The tool concluded that the drive had reported it could do 700kB/S while
> the software insisted it needed to be capable of at least705.6kB/S. It
> looked like in some places the kernel used a nominal 175kB/S as the
> conversion figure and in others 176.4kB/S. About then the maze of twisty
> little passages and the loss of time to persue it to a conclusion wore
> thin and I moved on to making money to pay for my food and housing and
> clothing by being a mercenary instead of philanthropist. I could have
> done a quick hack to cdrecord except it appears to be intimately tied
> to too many other things for which I'd have to install source and deal
> with. 'Sides, it looked like the kernel was slightly internally schizoid.
> That MIGHT be the proper place to repair things. And ide-scsi or ide-cd
> might be the proper place to start investigating.
>
> This problem seems to have existed since 2.0.xx days when I first noticed
> I could not get cdrecord to even TRY to record at the drive and disc
> rated speeds. (Nor can I get it to do it with 2.2.16 on a machine with a
> SCSI HP CDWriter+ 9200 which won't do its rated speed, either.)
>
> {^_^}
>
>

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