Yuwen Dai wrote:
I burn DVD/CDs from ISO files.  In order to verify the burning is correct,
...
The above method does work, but too time consuming because of the md5sum
calculating.  Do you have any suggestion to improve the efficiency?

This tool recursively compares file names, mtimes, and sizes in two
directory trees, and reports any differences found:

http://search.cpan.org/~dpchrist/Dpchrist-Directory-1.018/perl-bin/dirdiff


Assuming you have a working Perl cpan installation, you can install the
Dpchrist::Directory module and dirdiff script as follows:

    cpan Dpchrist::Directory


HTH,

David


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