12 Jul 2002 19:44
raw CD device reading
Jeffrey Bridge <jeffrey+paranoiadev <at> firehead.org>
2002-07-12 17:44:53 GMT
2002-07-12 17:44:53 GMT
[w00t! first traffic on this list in eight months...] If I understand things correctly, there are either one or two ECC codes used with CD-ROMs. One is used with audio, and another is used with data. The data code seems to pad 2048-byte sectors to 2536 bytes, or something like that. I don't know about the audio one. If you have a CD which has intentionally bogus ECC data, it makes it so you will get a kernel error when trying to read it, right? Does cdparanoia get around this and talk to the device directly to read 2536-byte sectors? If so, how is this accomplished? My interest in this subject stems from having aquired a DIVX disc yesterday, and trying to read it in a DVD-ROM drive. Interpreting it as a UDF image (either in kernel-land or userland), some of the files read correctly, but some of them get SCSI errors when you try to read the sectors. I'd like to know if there's a way to read at a lower level to get around this inability to read the sectors. ~jeffrey :j --- >8 ---- List archives: http://www.xiph.org/archives/ Paranoia homepage: http://www.xiph.org/paranoia/ To unsubscribe from this list, send mail to 'paranoia-dev-request <at> xiph.org' containing only the word 'unsubscribe' in the body. No subject is needed. Unsubscribe messages sent to the list will be ignored/filtered.
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