Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 7 Nov 2003 22:05:35 +0100 | From | Jens Axboe <> | Subject | Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt |
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On Thu, Nov 06 2003, Prakash K. Cheemplavam wrote: > Prakash K. Cheemplavam wrote: > >bill davidsen wrote: > > > >>In article <3FA8CA87.2070201@gmx.de>, > >>Prakash K. Cheemplavam <prakashkc@gmx.de> 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.
-- Jens Axboe
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