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Mike Richter wrote: > > At 07:38 AM 6/26/2003 -0700, Jerome Hartke wrote: > >Although the Red Book CD-DA has two levels of error correction using a > >cross-interleave Reed-Solomon code, an additional safeguard against > >degradation is available using CD-ROM Mode 1. This format adds a > >powerful, third level of error correction using a Reed-Solomon product > >code. (This third level is not available in CD-ROM Mode 2.) > > > >Although use of Mode 1 requires conversion of audio to WAV or other > >formats in order to obtain files, the additional effort should be > >mandatory for archival purposes. In addition, use ISO 9660 Level 1 > >volume and file structure, and disc-at-once recording. These options > >should be selectable in any professional grade recording software > >programs. > > > >Of course, media and recording drive quality are also very important. > > I agree completely on the need to archive as data and to take advantage of > the extra level of error correction, but note that that is also available > in Mode 2 Form 1. I know of no reason to prefer that to Mode 1, but it is > available and does provide the additional protection. > > Mike > [log in to unmask] > http://www.mrichter.com/ CD-ROM XA Mode 2/Form 1 does offer the same levels of error correction as CD-ROM Mode 1, but is not as compatible. Its intent is for interleaved multimedia applications where multiple extents of audio/video/graphics/ data files are interleaved. In many cases, real-time XA requirements place special demands on hardware and software. Since archival requirements include a concern regarding the long-term availability of playback equipment, simplest is best. Thus the strong preference for CD-ROM Mode 1. Note that CD-ROM Mode 2 is very different from CD-ROM XA Mode 2/Forms 1 & 2. Jerry Media Sciences, Inc.