Recently, I encountered a very embarrassing thing, making a boot disk without a good network environment. Downloading an image in such an environment is obviously unrealistic, but! I have another boot disk that has already been created. So I just need to clone this boot disk into another U disk.

# Preparation:

download：{% btn https://down.tstrs.me/%E5%B8%B8%E7%94%A8%E8%BD%AF%E4%BB%B6/, UltraISO, download fa-lg fa-fw %}

Here is the crack version, if it is genuine, you need to pay to unlock the ISO capacity limit)

a prepared boot disk

An empty U disk

# Extracting the boot record

Insert the prepared boot disk into the system, click to open UltraISO, select the boot disk, and click Start > Extract Boot Sector.

Change the file suffix from .bsf to .bin after the production is complete.

# Making a bootable CD

Copy all the files in the boot disk to UltraISO, like this:

But this time it is still displayed as a non-bootable disc, because we did not import the boot sector, the boot sector is the .bin file we exported earlier. Click Start > Load Boot File and select the file you exported earlier:

At this point you can see that it has changed from a non-bootable CD to a bootable CD:

You can save as an ISO image here, or you can create a boot disk directly.

If it is not without a network, I may never use this function of UltraISO. I have to say that the functions of these softwares, we usually only use 1% of them, the world is infinite, and there are many that can be explored.