>From: James Pearson <[EMAIL PROTECTED]>
>>I was wondering if anyone could shed some light on the
>>philosophy behind duplicating Volume Descriptors on a
>>single CDROM ? (I refer to exact copies, not one or
>>more Supplementary Volume Descriptors that each provide
>>their own hierarchy with possibly different character
>>sets and possibly the same files.)
>>
>>In reading the Volume Descriptors from an ISO9660 CDROM,
>>if I encounter a Logical Sector that cannot be read, I
>>have no idea whether what I missed duplicates another
>>Volume Descriptor or provides a unique hierarchy.
>>
>>What am I missing ? (in this particular area :-)
>mkisofs used to write out two Primary Volume Descriptors - from v0.99:
> /* For some reason, Young Minds writes this twice. Aw, what the heck */
> fwrite(&vol_desc, 1, 2048, outfile);
> fwrite(&vol_desc, 1, 2048, outfile);
> last_extent_written += 2;
>I guess it was to make mkisofs CDs 'compatible' with what ever 'Young Minds'
>generated.
Some time ago, I received a "BUG report" from Sun. Ther way of making CDs
bootabled did rely on the second PVD which was overwritten with a Eltorito VD.
J�rg
EMail:[EMAIL PROTECTED] (home) J�rg Schilling D-13353 Berlin
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