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Re: the media check problem



On Sat, Nov 13, 2004 at 07:06:43PM +0100, Dennis Bjorklund wrote:
> 1) It's the read ahead that causes the problem. If one use
>    hdparm and set the read ahead to 0 on the device, then I have
>    no problem to verify a cd using dd.

Correct

> Maybe someone like Alan Cox (but not limited to him!) will look at this
> and say it's stupid, and then I don't need to read the code :-)

The "end" of a CD-R is undefined for about 150K. ide-scsi correctly 
retries errors at the disk end and reduces the disk size based on the
error position. ide-cd doesn't. It's waiting someone who knows enough about
that area of the block layer to fix it


Alan


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