Messages in this thread | | | Date | Sun, 09 Nov 2003 11:49:27 +0100 | From | "Prakash K. Cheemplavam" <> | Subject | Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt |
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Jens Axboe wrote: > 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.
Yup, I verified it in windows. Same issue, so it is a hardware and not software issue.
Prakash
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