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<blockquote data-quote="BoraMurdar" data-source="post: 591260" data-attributes="member: 2291">Creation of bootable ISO from a bootable USB is very difficult as :When making a bootable ISO, you need to add the boot code separately (which is kept in a different location to the files). So you cannot just convert a bootable disk image into a bootable ISO without knowing what the bootloader code is and specifying the data that needs to go into the special position within the iso for the boot code. The boot code on a CD/DVD needs to load in the OS by reading sectors from a CD/DVD type of device, the boot code in your USB drives needs to read in sectors from a disk type device. CD &#039;sectors&#039; are in 2048 byte chunks, most mass storage devices use 512 byte sectors (at least at the BIOS level). Some boot loaders will cope with either type of boot device, but the code still has to be added to the ISO file in the correct position which is a different position from where it would be in a disk image.So it&#039;s better to burn recovery on CD and then make ISO from it, as it will keep the bootloader data on the same position. Or just use the whole Windows 10 Installation ISO to do a recovery process you need</blockquote>

[QUOTE="BoraMurdar, post: 591260, member: 2291"] Creation of bootable ISO from a bootable USB is very difficult as : When making a bootable ISO, you need to add the boot code separately (which is kept in a different location to the files). So you cannot just convert a bootable disk image into a bootable ISO without knowing what the bootloader code is and specifying the data that needs to go into the special position within the iso for the boot code. The boot code on a CD/DVD needs to load in the OS by reading sectors from a CD/DVD type of device, the boot code in your USB drives needs to read in sectors from a disk type device. CD 'sectors' are in 2048 byte chunks, most mass storage devices use 512 byte sectors (at least at the BIOS level). Some boot loaders will cope with either type of boot device, but the code still has to be added to the ISO file in the correct position which is a different position from where it would be in a disk image. So it's better to burn recovery on CD and then make ISO from it, as it will keep the bootloader data on the same position. Or just use the whole Windows 10 Installation ISO to do a recovery process you need [/QUOTE]

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