search for: number_of_cylinders

> Hi, > > Ady wrote: > > my suggestion to modify the _amount_ of Cylinders was intended to > > overcome the "by 4" (or rather, "by 2048") issue. > > Now i get your intention. You want to align the > resulting ISO to 4 full cylinders in order to avoid > the need for a cylinder size divisible by 4. > No :). I want to align to resulting

Hi, Ady wrote: > my suggestion to modify the _amount_ of Cylinders was intended to > overcome the "by 4" (or rather, "by 2048") issue. Now i get your intention. You want to align the resulting ISO to 4 full cylinders in order to avoid the need for a cylinder size divisible by 4. This would work. But with -h 255 -s 63 it could waste up to 32,899,072 bytes. >

...d computation does. It predicts the minimum number of cylinders which you need as padding target in isohybrid.c (or .in). Sorry for being sloppy with the natural language description of the concept. Let me try it more formal: The size of an image file which is aligned to full cylinder size is: number_of_cylinders * h * s * 512 If we divide by 2048 = 2 exp 11, we can cancel 512 = 2 exp 9 and get number_of_cylinders * h * s / 4 In order to cancel the remaining 4, we need two prime factors 2 among those of number_of_cylinders, h, and s. We find at least two 2s in h and s if and only if h * s is divisibl...