>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. As to why Young Minds did this, I have no idea - I know the Linux isofs driver 'searches' for a PVD anywhere in the first 100 blocks or so - it could have been for some buggy OS that may be missed the PVD if it was at the 17th block ... James Pearson -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
