Question

I used SARDU for multi-bootable live DVD. first I made live usb which made perfectly in which I can modified. then i try to made dvd in which i can’t modify isolinx.cfg but in usb i can modify syslinux.cfg. How can i modify isolinux.cfg then how to boot cd?

Answer 1

A DVD is a write-once media. When the file isolinux.cfg has been “burned” to the DVD disk, there is no way to change it (well, you could scratch it away with a tiny pin …)

You could use an overlay filesystem but that won’t help because the boot loader doesn’t support it (the file system needs the kernel, so the boot loader would need to start the kernel first to read its own config file).

[EDIT] One solution is to create copy the files from the DVD somewhere, make the changes and create a new DVD image (iso file) from that.

Next, make sure that the changes made it into the image (mount -o loop file.iso /mnt and then look at the files under /mnt. Don’t forget to replace file.iso with the correct name of the ISO/DVD image file on your hard disk!!)

If that is OK, create a bootable USB stick with the DVD image. This way, you can test that the image actually boots without wasting DVDs.

When everything works, burn a DVD.