[syslinux] isohybrid and ISO images whose size is not a multiple of 2048 bytes vs. VirtualBox

Ady ady-sf at hotmail.com
Wed Feb 18 15:26:15 PST 2015

> 1_ Calculate a potential Cylinders value;
> 2_ Calculate 'Cylinders * Heads * Sectors_per_track';
> 3._ Is the result of the previous step #2 a multiple of '4'?
> 3.a_ If it is, continue;
> 3.b_ If it is not, then add '1' to the attempted Cylinders value and 
> loop.
> 4_ Other conditions and logic already present in the isohybrid source 
> code still apply (e.g. the Cylinders value for the partition table 
> might be different than the one calculated after the above loop; the 
> input ISO image size shall be a multiple of 2048 bytes...).
To be clear, the above pseudo-code is also inaccurate in the way I 
wrote it, but I assume you get the idea.
> Regards,
> Ady.
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