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Incroyable HULK

Boot from USB Flash Drive?

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Well, according to my readings, I don't think it is possible either...

Which readings? why?

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I am using UltraISO from ezbsystems and there was a similar question to mine on their forum. Here is the administrator answer...

I've downloaded several bootable ISOs and I want to extract the entire contents of one of them to my 1GB USB flash drive. Problem is, when I extract the data, my computers can't boot from it.

As filesystem used by a 'USB flash drive' is quite different from a bootable CD, making a bootable USB flash from a bootable CD is not possible.

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there must be a way to somehow point to the USB flash drive files, no?

i.e. back before CD-ROMs were bootable devices, a floppy would load first, and point to the cd-rom to boot from.

Wouldn't that work in this case? make one CD that points to the USB device to boot from. I wouldn't think a file system would stop the booting then.

what do you guys think?

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Well, USB flash drives are essentially miniature, removable hard drives as far as the computer is concerned. So what we need is a way to write the boot sector to the flash drive (hard drive). Once we've achieved that, it's simply a matter of making the boot sector one for CDShell or a similar project, then just add whatever boot options we want from there.

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Oops, sorry for the double post

Edited by Jito463

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......So what we need is a way to write the boot sector to the flash drive (hard drive). Once we've achieved that, it's simply a matter of making the boot sector one for CDShell or a similar project, then just add whatever boot options we want from there.
"CD-Shell or a similar project" will not help any more for the case of USB-boot-device.

CD Shell, Boot Script, Diskemu or Boot CD Wizard, all those use the bios extension of your mainboard, with the name "El Torito". They use the bios function call to oprate. If boot from usb-device, there is no such bios functions!!!

USB-Boot uses the bios extension of the mainboard, but in compare with CD-Boot there is no standards/specifications of it. Every manufacturer of mainboards/bios can implement is own. That is why the bootable usb stick works only on a few mainboards/PCs, but not all.

If someone (from Intel? at best not from M$) definds a specification which would be accepted by all the mainboard manufacturers, then we can programming some utils/tools as boot loader, so multiboot on ubs stick can come.

At ther present we can also do something, if the current usb-boot-bios treat the usb device like a hdd:

1. partitioning the usb device

2. iinstall diff. OS on it

3. modifiy the mbr/install a boot manager on it

you have the "multiboot usb device" , cheers.

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I made a multi-boot CD image (ISO file) and I want to burn it on a USB drive. Is there any problem can do it?

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@ Scorp

Thanks, I've been reading the link you suggested...

I'll have to take the time to test at work, here at home I don't have a USB Drive handy.

If someone is willing to test, I suggest the following step :whistle:

1- start with something simple, a Windows XP boot image for example.

2- Try with a multiboot image, like EasyBoot or CDShell

Of course you should try this on recent hardware...

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The question is how to put the pre-made Mutli-Boot CD image into the USB stick and the USB stick can boot like a Mutil-Boot CD. ***** Of course, my motherboard can boot the USB Stick. I tried to install the Windows 98 on to my USB stick. It work*******

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The question is how to put the pre-made Mutli-Boot CD image into the USB stick and the USB stick can boot like a Mutil-Boot CD.

I don't think you can "merge" the ISO file to your USB drive...

If you take a look to the link provided by Scorp:

http://www.weethet.nl/english/hardware_bootfromusbstick.php

you can write your boot sector to the USB drive... similar to burning a boot CD with Nero where you have to specify the Boot Image File, etc...

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I wonder why are there so many people who ignored my prev. post totally! (too lower IQ to understand it?) I must quote it again:

CD Shell, Boot Script, Diskemu or Boot CD Wizard, all those use the bios extension of your mainboard, with the name "El Torito". They use the bios function call to oprate. If boot from usb-device, there is no such bios functions!!!

USB-Boot uses the bios extension of the mainboard, but in compare with CD-Boot there is no standards/specifications of it. Every manufacturer of mainboards/bios can implement is own. That is why the bootable usb stick works only on a few mainboards/PCs, but not all.

If someone (from Intel? at best not from M$) definds a specification which would be accepted by all the mainboard manufacturers, then we can programming some utils/tools as boot loader, so multiboot on ubs stick can come.

At ther present we can also do something, if your bios support the usb device as HDD-boot:

1. partitioning the usb device

2. install diff. OS on it / or copy diffrent hdd partion on it

3. modifiy the mbr or copy a installed hdd boot manager on it

you have the "multiboot usb device"

All what you quoted website talked about only usb-single-boot, but our themen is usb-multi-boot ! If you dont understand single-boot, how can you discuss multi-boot! If you cannot walk, sure you cannot run!

In my post I've clearly point out why the multiboot utility for CD cannot work on usb device. I've also point out what is possible,.

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