Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt

[Prakash K. Cheemplavam]

Jens Axboe wrote:
> On Thu, Nov 06 2003, Prakash K. Cheemplavam wrote:
>
> > Prakash K. Cheemplavam wrote:
> >
> > > bill davidsen wrote:
> > >
> > >
> > > > In article <3FA8CA87.2070201@xxxxxx>,
> > > > Prakash K. Cheemplavam <prakashkc@xxxxxx> wrote:
> > > >
> > > > | Sorry, I wasn't precise: The data is on the disc, as my DVD-ROM 
> > > > restores | the full image (md5sum matches), but the CD-RW does not.
> > > >
> > > > There is a problem with ide-scsi in 2.6, and rather than fix it someone
> > > > came up with a patch to cdrecord to allow that application to work
> >
> > > b) The writing or reading issue mentioned above. It is a bit hard to 
> > > find out, whether cdrecord actually *writes* an incomplete image 
> > > (without using -pad), ie. throwing away the last 4096 bytes, which 
> > > *only* happens in non-TAO mode. The programme CDRDAO shows the same 
> > > behaviour. Strange enough reading this DAO written image out with my 
> > > DVD-ROM makes this (missing?) 4096 bytes reappear... Well, maybe I 
> > > should patch the image and put some other bytes instead of the 00s at 
> > > the end to see, whether it is a write issue, a read issue of the writer 
> > > or a read issue of the reader. Anyway, it doesn't sound right to me, 
> > > what is happening at the moment...
> >
> > So tested further: I patched the very last byts of the image and these 
> > are my findings:
> >
> > In DAO mode, the complete image is actually written, but the writer is 
> > not able to read it out! The last 4096 bytes are not read. I put the 
> > CD-RW into my DVD-ROM, and it reads it out completely.
> >
> > So: Is cdrecord/cdrdao making something wrong (yes, I know I can use 
> > -pad, but I want an *identical copy*) or has the kernel ATAPI reading 
> > routine a bug? (Or has my drive a bug???? Well, I need to read the disc 
> > out in windows I guess...)
>
>
> See one of my mails from a few days ago. It's a hardware issue, some
> drives need a bit of pad at the end.

Yup, I verified it in windows. Same issue, so it is a hardware and not 
software issue.

Prakash



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