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Create an exact duplicate of a CD from the command line
Authored by: NetCurl on Jan 15, '04 03:35:00PM

The issue with the line bs=2048 is fairly simple. As you can find in the man page for dd, bs is block size, and superceeds the default Mac OS X block size of 4kb (4096 bytes). The NTFS default block size is 2kb (2048 bytes), and this may lead to problems when CD copying and mounting on Windows machines. CDs for Windows usually have 2kb block sizes, but Mac OS X can handle that and higher.

On CDs, block sizes correspond to data per sector I believe, and Windows adheres more directly with the Yellow Book standard of 2048. ISO CDs have a payload of 2048 bytes accompanied by another 200 or so bytes of header and other information.

Reference:

http://www.emedialive.com/Articles/ReadArticle.aspx?ArticleID=5132&PageNum=2



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