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Super GRUB2 Disk helps you to boot into most any Operating System (OS) even if you cannot boot into it by normal means. Tour Here there is a little video tour. Mar 14, 2017 The next step was to build a GRUB config that would mount the ISO loopback and boot off the kernel and initrd file within that ISO. On Debian-based systems, you can add bash scripts that output extra GRUB configuration to /etc/grub.d/ and run update-grub to build a new grub.cfg file. But, you also could just edit grub.cfg directly or otherwise. Also GRUB should be able to boot these kind of ISO images by simply setting a loopback option toGRUB boot options. TL;DR: It is possible to load the ISO file from the middle of the device, it can be easily done on FAT partitions. I'm asking help here for NTFS type of partitions.
My friend's laptop was in a car accident (he's fine!). However the laptop is very old its an Acer Aspire 1520 the CD-rom drive is broken and there is no floppy drive.
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I made him a USB boot before I took a look at it and found that his BIOS cannot boot from USB. The only thing I have is a GRUB console but he is keen to just install XP (on USB) and use it just for Movies.
Is it possible using the GRUB console to get access to the USB and start the windows install? It's a tall order but I think this may be the way, or trying to install via LAN which I don't think will be achievable.
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5 Answers
Here is a quick example of grub commands that might just work, explanations and caveats below.
Most likely for post-2010 installs.
Most likely for pre-2005 installs.
Grub Rescue Boot From Iso
For the 2005-2010 period, your guess is as good as mine, but if you use the command for the wrong version, you only get a harmless syntax error on the first command.
At startup, grub will probe for your devices and assign numbers to them. All devices that are partitioned (hard disks and flash drives) will also have numbers assigned. The format is
(<deviceName>,<partitionIndex>)
. In grub2
, partition indexes changed, so the two examples above have the same effect despite looking to use different roots.Your first device (
hd0
) is whichever device grub just loaded from. After that, you can usually assume that all the internal devices will come before your external devices. They will most likely be in the form of hd
and a number.After the comma is the partition index. Hard disks and thumb drives will almost always be partitioned, so you must choose the right (and most likely only) partition. CD-ROMs are usually not partitioned.
More documentation: http://www.gnu.org/software/grub/manual/html_node/Device-syntax.html
When choosing your root partition, you can use the Tab key to probe for device names and partition indexes. Just open parenthesis and start pressing Tab to see the list.
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EkevooEkevoo
To elaborate on new123456's comment:
The USB device should be detected as a mass storage device and treated just like a hard drive. So, in grub, type
root (hd
(don't press Enter yet) and then hit tab once or twice to see what hard drives Grub can see. The USB device, if it's recognized, will probably be hd1. Don't specify a partition number; just add a closing parenthesis. So the line will be root (hd1)
. Then after that, type the following:If that doesn't work, change
root (hd1)
to root (hd1,0)
and try it again.If for some reason Grub can't see the USB drive, try plugging in a USB CDROM and booting off that.
JonathanJonathan
The
chainloader +1
thing might not work if the BIOS isn't good at booting from a USB key (which was why I was wanting to use Grub anyways). In this case, there's some deep magic at https://help.ubuntu.com/community/Grub2/ISOBoot that works, at least for Ubuntu. The crucial bit is mucking with the grub command that identifies the
vmlinuz
file, passing the iso-scan/filename
argument. Somehow, that helps it figure out that the entire boot filesystem is stuck in an ISO file. I don't know how the heck it works, but it does. These are (approximately) the Grub 2 commands I used:The
/path/to/iso/file
should be the path to the ISO file on the USB key. The (fd0,msdos1)
identifies the USB key. Tab-completion is super-helpful on the loopback
line, and not useful for the arguments to vmlinuz
.Paul StansiferPaul Stansifer
This isn't going to be terribly helpful in your friend's case (unless there's a way I'm unaware of to get plop on the device in the first place -- maybe a usb cd-rom, or usb floppy drive?), but this is a terrific little application, which has helped me rig a number of old machines to boot off of usbs when their bios wouldn't allow it.
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You can't boot from usb in grub if the bios doesn't allow for it itself. I once had to setup a sort of recovery partition on a hard disk containing the win7 setup disk contents, install grub, and then used that to boot the win7 setup partition to install it to the rest of the hard drive.
hanetzerhanetzer
Grub Boot Iso From Ntfs
Active5 years, 1 month ago
How can I boot into an ISO file in GRUB? The ISO file is on a reiserfs partition and GRUB can access it (already tested that).
Albert
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2 Answers
The biggest problem with booting an ISO file is that ISOs that are designed to be booted are almost always designed to be booted from a CD. As explained on Marco's blog regarding Grub 2 (emphasis mine):
GRUB can read ISO9660 (”iso”) images. It can for example load the first few sectors and boot it. But most people do not realize is “what then?”. What would the loaded operating system do? It will most likely look for a CDROM, which it won’t find, and fail.
(If your browser offers only the 'Save' option - save the file to a temporary dialog and then manually run it when the download completes). The download of Able2Extract Professional will begin. When it completes, you will see the following installation steps: 'Welcome to the Able2Extract Professional 14 Install program': click 'Next' to continue.
So the dead-simple-est way to boot from some random ISO file is to load it into a virtual machine (VirtualBox, VMware, or Virtual PC) as a virtual CD and boot it there. That should almost always work, because to the VM, it's not an ISO file -- it's a real CD on real CD hardware.
Booting from an ISO file on bare metal is much harder. How you do this depends on which version of Grub you're using, and results can differ depending on what ISO you're using and how it was configured to boot. This is why most boot-ISO-from-USB tools (Unetbootin, WinToFlash, etc) usually extract the ISO contents to the drive -- because that way they can be accessed directly, without confusing the OS being booted.
Grub 1
.. not sure. If possible, menu entries will probably look a lot like Grub4DOS, though I think the 'map --hook' command is a Grub4DOS enhancement. On the plus side, Grub has wider filesystem support than Grub4DOS.
A note on Grub with reiserfs (unconfirmed) indicates you 'have to mount your partition with
notail
for it to work'.Memdisk is an option; see below.
Grub4DOS
Grub4DOS offers some experimental 'CD emulation' that works with some ISOs. Unfortunately, Grub4DOS only reads FAT32/NTFS filesystems. Download Grub4DOS.
Here's a sample entry (source):
Supposedly the Win7 ISO can be booted with this entry:
Other ISOs can be booted with Memdisk:
You can also use a menu configurator like MultiBootISOs.exe from PenDriveLinux. Place ISOs on the flash drive, and run the utility to install the bootloader and configure the boot menu.
Here's a Hak5 episode on installing Grub4DOS.
Grub 2
Here's a couple of example Grub2 entries. chainloader doesn't work to boot an ISO at present, so these entries must (1) use loopback to 'mount' the ISO, and (2) add something like iso-scan or findiso to the linux line that specifies the ISO file.
Grub Boot Isolinux.bin
Unfortunately, there's no generic way to do this. Each different boot entry must be customized to the target ISO's contents. Most Linux LiveCDs use ISOLINUX as a bootloader; find the isolinux.cfg and examine that boot entry to see what it usually boots.
Example entries (source):
If you're trying to boot a non-Linux LiveCD, you may be out of luck. Again, Memdisk may help:
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You can use dd from the terminal to write an iso file to a partition. Just be careful, if you use dd wrong you can wipe everything. It should look something like this:dd if=Desktop/LinuxCDFile.iso of=/Path/To/Partition
Grub Boot Iso Ubuntu
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