Re: IDE CDROM and dd...

From: Jim Nance (jnance@nortelnetworks.com)
Date: Thu Jun 08 2000 - 06:18:52 EST


On Wed, Jun 07, 2000 at 12:46:09AM -0400, Jeff Garzik wrote:
> Jens and lkml,
>
> I have consistently had a problem with kernels >= 2.2.x where dd'ing
> from /dev/cdrom to a file fails. In fact this operation has never
> worked for me on a CDROM drive faster than 4X, and this behavior is
> noted across multiple CDROM drivers and multiple IDE controllers.
> Mounting the CDROM (as opposed to 'dd') works just fine, even under
> stress.

I am having similar problems trying to dd a music CD. Is this supposed to
work, or does the driver "know" something about what the data on the CD is
supposed to look like? I see from your other posts that you did manage to
get some data off the disc. It fails for me at the beginning and I do not
get anything.

Thanks,

Jim

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