![]() | |||||||||||||
Messages in this thread |
Sebastian wrote: > (please, don't forget to me and axboe@suse.de) Did I? I'm sorry, I was *sure* I hit reply-to-all. >> Yes, but now we need to find out why one interface fails while another >> works.. I have the same problem here using cdrdao when ripping entire disk >> images. I'd love to fix the real issue rather than work around it by having >> userspace use another interface. >> I would have thought that both interfaces should return the same data.. >> >> Brad > > I think cdrdao can use SG_IO if you tell it to. Check their documentation. Or did I misunderstand what you're saying? Slightly.. If I'm not mistaken, we have a piece of software (for arguments sake let's call it cdparanoia). The stock software uses the ATA or ATAPI interface and produces bodged reads, the modified version you have uses SG_IO and produces accurate reads. What I'm wondering is why the difference, and is there a problem with the ATA/ATAPI interface that leads to this that needs looking into. *or* is it a userspace problem with the way cdparanoia is using that interface *or* is it an inherent problem/limitation with that particular interface I can reproduce this with cdrdao by reading a cd 10 times with all combinations of paranoia mode attempted. I get 10 x ~550 meg data.bin files that all differ. I'm thinking I need to work up a script that diffs them by audio sector size chunks to see if there is a pattern there somewhere, but you would think that somewhere 2 reads in 10 would be identical. Brad -- "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so." -- Douglas Adams - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2006-01-07 19:46 [from the cache] ©2003-2008 | |||||||||||||