Showing posts with label grub. Show all posts
Showing posts with label grub. Show all posts

Monday, June 20, 2016

GRUB - Rescue BootLoader on a USB Flash Drive

My goal is to just have a GRUB bootloader (without a Linux instalation) on a USB Flash Drive to:

  • Boot OS with Bootloaders without entering the BIOS
  • Boot OS with Broken Boot Loaders
  • Boot Linux Live CDs

 

Installing the GRUB Boot Loader

Run a live CD like Ubuntu, a boot i without installing it.

First list your disks in order to identify you USB Flash Drive

    sudo fdisk -l

if you have trouble identifying you USB Flash Drive just run the command above without the USB Flash Drive, the insert it and list again, compare the outputs, and the extra disk is you USB Flash Drive.

My USB Flash Drive is “sdb1” (b=second HD | 1=first partition), now let’s make a folder to mount the usb flash drive (my Flash Drive was formated with the ext4 filesystem), and mount it:

    sudo mkdir /mnt/USB
    sudo mount /dev/sdb1 /mnt/USB

Now let’s just install the the bootloader

    sudo grub-install --force --removable --boot-directory=/mnt/USB/boot /dev/sdb

boot code goes on /dev/sdb and grub files on /mnt/USB/boot.

 

Set Up the Grub Configuration FIle

Now just create/edit the grub config file

    nano /mnt/USB/boot/grub/grub.cfg

and input the following configuration:

grub.cfg
_____________________________________________

set timeout=10
set default=0

menuentry "#### Boot OS with Bootloaders without entering the BIOS ####" {set root=(hd1)}

menuentry "HD0 (First HD – This USB Flash Drive)" {
set root=(hd0)
chainloader +1
}

menuentry "HD1 (Second HD)" {
set root=(hd1)
chainloader +1
}

menuentry "HD2 (Third HD)" {
set root=(hd2)
chainloader +1
}

menuentry "HD3 (Fourth HD)" {
set root=(hd3)
chainloader +1
}

 

menuentry "#### Boot OS with Broken Boot Loaders ####" {set root=(hd1)}

menuentry "Ubuntu 16.04 (HD1 - First HD)"  {

    insmod part_msdos
    insmod ext2
    set root=(hd1,msdos1)

    echo 'Loading Linux Kernel...'
    linux /boot/vmlinuz-4.4.0-24-generic root=/dev/sda1
       
    echo 'Loading Initial Ramdisk ...'
    initrd /boot/initrd.img-4.4.0-24-generic
    boot
}

menuentry "Windows XP/7/10 (HD1 - First HD)"  {

    insmod part_msdos
    insmod ntfs
    set root=(hd1,msdos1)

    drivemap -s (hd0) ${root}
    chainloader +1
}

 

menuentry "#### Boot Linux Live CDs ####" {set root=(hd1)}
   
menuentry "Ubuntu 16.04 ISO (On This USB PEN Drive)" {

    set isofile="/ubuntu-16.04-desktop-amd64.iso"
    loopback loop (hd0,msdos1)$isofile
    linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=$isofile noprompt noeject
    initrd (loop)/casper/initrd.lz
}

This is what it looks like:

image

You migth need to adjust some things if you have more disks, partitions or diferent linux distro. To make it easyer I have put the things you migth need to change in bold.

The above config was for the following setup

  • One USB Flash Drive (with Grub Installed)
    • hd0,msdos1 - First HD | First Partition – MBR Geometry
    • This is was my USB Flash Drive
  • One Hard Drive for OS
    • hd1,msdos1 – Second HD | First Partition – MBR Geometry
    • This is the Disk with the OS

If you have trouble Identifying you disks and partion you can press ‘c’, on the grub menu, to get the GRUB command line and run “ls” :

image

this was very hepfull, specially identifying the the name for the MBR partitions aka “msdos” .

Related Links

Monday, May 30, 2016

Linux – Howto Boot an ISO from GRUB

Linux’s GRUB2 boot loader can boot Linux ISO files directly from your hard drive. Boot Linux live CDs or even install Linux on another hard drive partition without burning it to disc or booting from a USB drive.

We performed this process on Ubuntu 14.04 — Ubuntu and Ubuntu-based Linux distributions have good support for this. Other Linux distributions should work similarly.

This trick requires you have a Linux system installed on your hard drive. Your computer must be using the GRUB2 boot loader, which is a standard boot loader on most Linux systems. Sorry, you can’t boot a Linux ISO file directly from a Windows system using the Windows boot loader.

Download the ISO files you want to use and store them on your Linux partition. GRUB2 should support most Linux systems. if you want to use them in a live environment without installing them to your hard drive, be sure to download the “live CD” versions of each Linux ISO. Many Linux-based bootable utility discs should also work.

 

Check the Contents of the ISO File

You may need to look inside the ISO file to determine exactly where specific files are. For example, you can do this by opening the ISO file with the Archive Manager/File Roller graphical application that comes with Ubuntu and other GNOME-based desktop environments. In the Nautilus file manager, right-click the ISO file and select Open with Archive Manager.

Locate the kernel file and the initrd image. If you’re using a Ubuntu ISO file, you’ll find these files inside the casper folder — the vmlinuz file is the Linux kernel and the initrd file is the initrd image. You’ll need to know their location inside the ISO file later.

clip_image001

 

Determine the Hard Drive Partition’s Path

GRUB uses a different “device name” scheme than Linux does. On a Linux system, /dev/sda1 is the first partition on the first hard disk — a means the first hard disk and 1 means its first partition. In GRUB, (hd0,1) is equivalent to /dev/sda0. The 0 means the first hard disk, while the1 means the first partition on it. In other words, in a GRUB device name, the disk numbers start counting at 0 and the partition num6ers start counting at 1 — yes, it’s unnecessarily confusing. For example, (hd3,6) refers to the sixth partition on the fourth hard disk.

You can use the fdisk -l command to view this information. On Ubuntu, open a Terminal and run the following command:

sudo fdisk -l

You’ll see a list of Linux device paths, which you can convert to GRUB device names on your own. For example, below we can see the system partition is /dev/sda1 — so that’s (hd0,1) for GRUB.

clip_image002

 

Create the GRUB2 Boot Entry

The easiest way to add a custom boot entry is to edit the /etc/grub.d/40_custom script. This file is designed for user-added custom boot entries. After editing the file, the contents of your /etc/defaults/grub file and the /etc/grub.d/ scripts will be combined to create a /boot/grub/grub.cfg file — you shouldn’t edit this file by hand. It’s designed to be automatically generated from settings you specify in other files.

You’ll need to open the /etc/grub.d/40_custom file for editing with root privileges. On Ubuntu, you can do this by opening a Terminal window and running the following command:

sudo gedit /etc/grub.d/40_custom

Feel free to open the file in your favorite text editor. For example, you could replace “gedit” with “nano” in the command to open the file in the Nano text editor.

Unless you’ve added other custom boot entries, you should see a mostly empty file. You’ll need to add one or more ISO-booting sections to the file below the commented lines.

clip_image003

Here’s how you can boot an Ubuntu or Ubuntu-based distribution from an ISO file. We tested this with Ubuntu 14.04:

menuentry “Ubuntu 14.04 ISO” {
set isofile=”/home/name/Downloads/ubuntu-14.04.1-desktop-amd64.iso
loopback loop (hd0,1)$isofile
linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=${isofile} quiet splash
initrd (loop)/casper/initrd.lz
}

Customize the boot entry to contain your desiredmenu entry name, the correct path to the ISO file on your computer, and the device name of the hard disk and partition containing the ISO file. If the vmlinuz and initrd files have different names or paths, be sure to specify the correct path to those files, too.

(If you have a separate /home/ partition, omit the /home bit, like so: set isofile=”/name/Downloads/${isoname}”).

Important Note: Different Linux distributions require different boot entries with different boot options. The GRUB Live ISO Multiboot project offers a variety of menu entries for different Linux distributions. You should be able to adapt these example menu entries for the ISO file you want to boot. You can also just perform a web search for the name and release number of the Linux distribution you want to boot along with “boot from ISO in GRUB” to find more information.

clip_image004

If you want to add more ISO boot options, add additional sections to the file.

Save the file when you’re done. Return to a Terminal window and run the following command:

sudo update-grub

clip_image005

The next time you boot your computer, you’ll see the ISO boot entry and you can choose it to boot the ISO file. You may have to hold Shift while booting to see the GRUB menu.

If you see an error message or a black screen when you attempt to boot the ISO file, you misconfigured the boot entry somehow. Even if you got the ISO file path and device name right, the paths to the vmlinuz and intird files on the ISO file may not be correct or the Linux system you’re booting may require different options.

Taken From: http://www.howtogeek.com/196933/how-to-boot-linux-iso-images-directly-from-your-hard-drive/

Monday, September 29, 2014

Boot Linux ISOs From Hard Drive ( GRUB )

How to Boot Linux ISO Images Directly From Your Hard Drive

Linux’s GRUB2 boot loader can boot Linux ISO files directly from your hard drive. Boot Linux live CDs or even install Linux on another hard drive partition without burning it to disc or booting from a USB drive.

We performed this process on Ubuntu 14.04 — Ubuntu and Ubuntu-based Linux distributions have good support for this. Other Linux distributions should work similarly.

Get a Linux ISO File

How to Configure the GRUB2 Boot Loader’s Settings
Ubuntu and most other Linux distributions now use the GRUB2 boot loader. You can change its settings to select a... [Read Article]

This trick requires you have a Linux system installed on your hard drive. Your computer must be using the GRUB2 boot loader, which is a standard boot loader on most Linux systems. Sorry, you can’t boot a Linux ISO file directly from a Windows system using the Windows boot loader.

Download the ISO files you want to use and store them on your Linux partition. GRUB2 should support most Linux systems. if you want to use them in a live environment without installing them to your hard drive, be sure to download the “live CD” versions of each Linux ISO. Many Linux-based bootable utility discs should also work.

Check the Contents of the ISO File

You may need to look inside the ISO file to determine exactly where specific files are. For example, you can do this by opening the ISO file with the Archive Manager/File Roller graphical application that comes with Ubuntu and other GNOME-based desktop environments. In the Nautilus file manager, right-click the ISO file and select Open with Archive Manager.

Locate the kernel file and the initrd image. If you’re using a Ubuntu ISO file, you’ll find these files inside the casper folder — the vmlinuz file is the Linux kernel and the initrd file is the initrd image. You’ll need to know their location inside the ISO file later.

clip_image002

Determine the Hard Drive Partition’s Path

GRUB uses a different “device name” scheme than Linux does. On a Linux system, /dev/sda0 is the first partition on the first hard disk — a means the first hard disk and 0 means its first partition. In GRUB, (hd0,1) is equivalent to /dev/sda0. The 0 means the first hard disk, while the1 means the first partition on it. In other words, in a GRUB device name, the disk numbers start counting at 0 and the partition num6ers start counting at 1 — yes, it’s unnecessarily confusing. For example, (hd3,6) refers to the sixth partition on the fourth hard disk.

You can use the fdisk -l command to view this information. On Ubuntu, open a Terminal and run the following command:

sudo fdisk -l

You’ll see a list of Linux device paths, which you can convert to GRUB device names on your own. For example, below we can see the system partition is /dev/sda1 — so that’s (hd0,1) for GRUB.

clip_image003

Create the GRUB2 Boot Entry

The easiest way to add a custom boot entry is to edit the /etc/grub.d/40_custom script. This file is designed for user-added custom boot entries. After editing the file, the contents of your /etc/defaults/grub file and the /etc/grub.d/ scripts will be combined to create a /boot/grub/grub.cfg file — you shouldn’t edit this file by hand. It’s designed to be automatically generated from settings you specify in other files.

You’ll need to open the /etc/grub.d/40_custom file for editing with root privileges. On Ubuntu, you can do this by opening a Terminal window and running the following command:

sudo gedit /etc/grub.d/40_custom

Feel free to open the file in your favorite text editor. For example, you could replace “gedit” with “nano” in the command to open the file in the Nano text editor.

Unless you’ve added other custom boot entries, you should see a mostly empty file. You’ll need to add one or more ISO-booting sections to the file below the commented lines.

clip_image004

Here’s how you can boot an Ubuntu or Ubuntu-based distribution from an ISO file. We tested this with Ubuntu 14.04:

menuentry “Ubuntu 14.04 ISO” {
set isofile=”/home/name/Downloads/ubuntu-14.04.1-desktop-amd64.iso
loopback loop (hd0,1)$isofile
linux (loop)/casper/vmlinuz.efi boot=casper iso-scan/filename=${isofile} quiet splash
initrd (loop)/casper/initrd.lz
}

Customize the boot entry to contain your desiredmenu entry name, the correct path to the ISO file on your computer, and the device name of the hard disk and partition containing the ISO file. If the vmlinuz and initrd files have different names or paths, be sure to specify the correct path to those files, too.

(If you have a separate /home/ partition, omit the /home bit, like so: set isofile=”/name/Downloads/${isoname}”).

Important Note: Different Linux distributions require different boot entries with different boot options. The GRUB Live ISO Multiboot project offers a variety of menu entries for different Linux distributions. You should be able to adapt these example menu entries for the ISO file you want to boot. You can also just perform a web search for the name and release number of the Linux distribution you want to boot along with “boot from ISO in GRUB” to find more information.

clip_image005

If you want to add more ISO boot options, add additional sections to the file.

Save the file when you’re done. Return to a Terminal window and run the following command:

sudo update-grub

clip_image006

The next time you boot your computer, you’ll see the ISO boot entry and you can choose it to boot the ISO file. You may have to hold Shift while booting to see the GRUB menu.

If you see an error message or a black screen when you attempt to boot the ISO file, you misconfigured the boot entry somehow. Even if you got the ISO file path and device name right, the paths to the vmlinuz and intird files on the ISO file may not be correct or the Linux system you’re booting may require different options.

Taken From: http://www.howtogeek.com/196933/how-to-boot-linux-iso-images-directly-from-your-hard-drive/

Wednesday, June 10, 2009

Booting ISOs From a USB Flash Drive With Grub4Dos

Introduction
Section 1 - Installing Grub4DOS
Section 2 - Setup Booting an ISO File (Acronis ISO)
Additional Notes


Introduction

Grub4DOS is a boot manager that can be easily installed to a flashdrive or hard drive. It allows booting multiple operating systems directly as well as booting into bootable partitions.

For the purpose of this guide, Grub4DOS will be used to setup a flashdrive to boot the Acronis Resuce Media. This can be done by booting to the partition on the flashdrive (as setup by the Acronis Media Builder program) or by directly booting the Acronis ISO file. When you use the ISO method, you can put as many Acronis ISO images as required on the same flashdrive. This allows you to easily be able to boot into True Image Home 9, 10, 11, 2009, Echo Workstation, etc. by just selecting the desired menu entry.

Tip: It is highly recommended that you read through the entire instructions before you begin this procedure.
Note: Either of these methods work equally well on USB hard drives or internal drives too as long as another boot manager (such as BootIt NG) is not installed on the drive

While it is always recommended to have backups of any important data before making any changes to your drives, installing Grub4DOS is not a destructive procedure. Existing partitions and data on the flashdrive should not be erased or corrupted in any way.


Section 1 - Installing Grub4DOS

Before Grub4DOS can be installed, several files need to be downloaded and unzipped. One is the Grub4DOS program and the other is the Installer. Click on the links below to download the files. Save them to a known location (My Downloads, for example) so they're easy to find.



Tip: For those interested, more information on Grub4Dos can be found at the following locations:
Grub4Dos Main Page
Grub4Dos Tutorial
Grub4Dos Guide (hosted by boot-land.net)
Grub4Dos GUI Installer Downloads


Extract the downloaded zip files into separate folders. For example, you may unzip Grub4DOS to C:\Grub4DOS and the Installer to C:\Grub4DOS-Installer. You may also choose to unzip them into a folder named after the zip file's name.

If your flashdrive is not already plugged into the computer, plug it in now.

The next step is to run the Grub4DOS Installer on the flashdrive. Browse to the Installer's unzipped folder using Windows Explorer.












In Windows XP, just run the grubinst_gui.exe program.

In Vista, you'll need to run grubinst_gui.exe in Administrator mode. Right-click on the program file and select Run as administrator from the pop-up menu.







You may get a security pop-up window asking if you want to run the program. Select Run to start the program.















In Vista, if you have UAC turned on (the default setting), you'll get another warning. Select Allow to let the program start.
















Once the program is started, select the Disk option, then click the Disk Refresh button and then select your flashdrive from the dropdown box.












You should be able to tell which disk is your flashdrive by the size shown for each drive. In this example, my 8GB flashdrive is easy to pick out.







IMPORTANT: Make sure you select your flashdrive from the dropdown list and not a different drive (if installing to a USB hard drive or an internal drive, make sure it's the correct one). If you accidentally select the wrong drive, you may not be able to boot your system without doing a boot repair.

Now click the Part List Refresh button, then the dropdown box and finally select the Whole disk (MBR) option.












Check the Don't search floppy option, leave all the other options unchecked and cleared and then click the Install button to install Grub4DOS to the MBR of the flashdrive.






















Hopefully, you'll get the message that the installation was successful.






Press Enter to close the Command Prompt window. The Grub4DOS MBR and booting code is now installed on the flashdrive.

The next step is to copy the grldr file to the flashdrive's root folder. Using Windows Explorer, browse to the folder where you unzipped the Grub4DOS program and copy the file to the flashdrive.













Grub4DOS is now installed on the flashdrive. Next we will show howt to boot an ISO from Grub4DOS.


Section 2 - Setup Booting an ISO File (Acronis ISO)

The ability to boot ISO files directly is one of the newer features of Grub4DOS. It is still a work in progress and has problems with some types of ISO files. However, in my use and testing, it hasn't had any problems with the Acronis ISO files.

The flexibility allowed by being able to boot the ISO file directly makes keeping multiple versions and/or different builds on the same flashdrive an easy task. Adding them is as simple as putting the ISO file on the flashdrive and adding the menu entry to boot it.

As with the partition method, there are only two steps needed to use your Grub4DOS flashdrive in this fashion.

First, run the Acronis Media Builder. However, instead of specifying the flashdrive as the destination device, select to create an ISO file. You can save the ISO file directly to the flashdrive if you wish.

Second, create the Grub4DOS menu.lst file with the entry to start the Acronis Media. The menu.lst file is a plain text file created using the Windows Notepad program. This file must be located in the root folder of the flashdrive. Start the Notepad program and type (or copy and paste) in the following text:


timeout 10
default 0

title Acronis True Image Home 2009 (9,615)
map (hd0,0)/ti-12-9615.iso (hd32)
map --hook
chainloader (hd32)
boot

title CommandLine
commandline

title Reboot
reboot

title Halt
halt
















Note: In this example, I've used Acronis True Image Home 2009 (9,615) as the menu entry's title for the Acronis Media. Feel free to use whatever name you want. Also note that I used ti-12-9615.iso for the ISO filename. You can use whatever name is appropriate, however I would recommend you don't put spaces into the ISO's filename.

Save the file to the root folder of the flashdrive with the name: menu.lst

Tip: If Notepad appends a ".txt" to the filename, just rename the file to menu.lst using Windows Explorer

If you have the Windows Explorer option set to hide filename extensions for known file types, you may need to disable it. Otherwise, explorer may display menu.lst when the actual filename is menu.lst.txt. Click here for instructions.










A sample menu.lst file can be downloaded below. If you use it, make sure to rename it to menu.lst once it's on the flashdrive. You will also need to edit it as necessary for your ISO's filename.


Download
Sample menu.lst file

To update this flashdrive to a different version or build of the Acronis Media, just rerun the Media Builder program and save the new ISO file to the flashdrive. If you are replacing an existing ISO file, no other changes are needed. If you are adding an ISO file, edit the menu.lst file and add the new menu entry. For example: If you want to add your True Image Home 10 build 4,942 ISO (ti-10-4942.iso) to the flashdrive, you would put the ISO file on the flashdrive and add the following menu entry:

title Acronis True Image Home 10 (4,942)
map (hd0,0)/ti-10-4942.iso (hd32)
map --hook
chainloader (hd32)
boot


Additional Notes
  • In these instructions, the timout value for booting the default Grub4DOS menu entry is 10 seconds. If you want a shorter or longer time, change the value.
  • If you setup to boot the ISO files, you can place the ISO files into folders instead of having them in the root folder. For example: If you want all of your Acronis ISO files to be in the \acronis folder, just modify the entry in the menu.lst file to include the folder in the path to the ISO file: map (hd0,0)/acronis/ti-12-9615.iso (hd32)

Taken From: http://themudcrab.com/acronis_grub4dos.php

An alternative method, to boot an ISO from a USB Flash Disk (PEN), can be found in this Blog here

Saturday, April 21, 2007

Bootable DOS USB Flash Drive + Booting ISOs with Grub 4 Dos

Tagged: usb tutorials hardware
Introduction

So you just got your new computer from Dell, HP, etc. and for some reason who knows what you need to boot from a boot disk. AHHHH WTF!!! They didn’t install a floppy drive on my computer. That is ok because you have come to the right place. I am going to show you how to turn your USB Flash Drive into a boot disk (they come with many new computers instead of floppy drives)
Get the Stuff

For this tutorial there are some things you will need to have:
USB Flash Drive
HP USB Flash Drive Format Tool Mirror 1 Mirror 2 (Password for mirrors is "pasta")
Win98 Boot Disk or the Files -> You can use the ones from Windows Millenium also.
Some of these Programs (makes the disk more useful)

Getting it Ready
After downloading the HP Format Tool install it. Get your boot disk or the downloadable files and copy/extract them to a folder on your HD. Make sure anything on your USB Drive is backed up because we are going to format it...
Make it Bootable
Open the HP Format ToolStart/Programs/Hewlett-Packard Company/HP USB Disk Storage Format Tool

It should automatically select your USB Drive.
Select FAT32 or FAT Under File System.
Select Create a DOS startup disk
Select using DOS system files located at and point to the folder containing the boot disk files.
Then click Start

Now you have a USB PEN that works like a "DOS floppy startup disk", like the ones created by Windows 98 and Windows ME, were you could execute several, dos tools, basically disaster recovery tools.



Add Some More Stuff
As is your new boot disk can’t do much other than boot the computer to DOS so you need to add other programs to make it more useful. I put a small list of files and programs together it is located at http://www.cfists.com/usb.htm.



Booting ISOs from Your USB Flash Drive - by Adding Grub4Dos

A very usefull program to use with this is Grub for DOS (Grub4Dos), with this you can boot anything from your usb pen, like:

- Your Hard drive (to when you ruin your hardrive's MBR)
- Isos on pen/hardrive
...

by configuring the menu.lst an execute grub.exe, or just execute grub.exe and input there the comands instead of puting them in the menu.lst file.

Now I'm going to show you how to use the bootable usb flash drive created before, to boot an iso from it, by adding grub4dos to the flash drive.

#1 - Download Grub4Dos #####

You can get it here, you just google for "Grub 4 Dos".
The file I downloaded was grub4dos-0.4.4.zip.
Now just extract it, and it should create a folder "grub4dos-0.4.4" were all of it's files are.


#2 - Adding Grub4Dos to the Bootable USB Flash Drive #####

Just copy the file "grub.exe", in the folder "grub4dos-0.4.4", to the flash drive.
And create an empty file named "menu.lst" in the flash drive, this file is the menu that grub presents, which you can configure it to have an option, to boot you hardrive (window, linux, ...), to boot ISOs, etc.

#3 - Making Grub4Dos BOOT an ISO #####

In order to make Grub boot an ISO you have to configure this option on grub's menu file "menu.lst", like this:

timeout 10
default 0

title Hirens Boot CD(9,615)
map (hd0,0)/hirensbootcd95.iso (hd32)
map --hook
chainloader (hd32)
boot

title Windows 7
map (hd0,0)/Windows7.iso (hd32)
map --hook
chainloader (hd32)
boot



title CommandLine
commandline

title Reboot
reboot

title Halt
halt


In this example have configured the "menu.lst", to have two isos to boot, one is the hiresns boot cd iso (hirensbootcd95.iso), and the other is the recently released Windows 7 (Windows7.iso), as you can see you can easly add more ISOs, whith a little copy paste and changing the ISOs name.

#4 - Adding the ISOs to the Flash Drive #####

As you can see in "menu.lst" on "map (hd0,0)/xxx.iso", the ISOs aren't in any folder, then just send the ISOs to the flash drive.

The flash drives files list should look like this:

menu.lst
grub.exe
hirensbootcd95.iso
Windows7.iso

And that's it you ISO booting flash drive is ready to be tested.

In order to do that your bios, must suport booting from a usb flash drive, and must have the correct boot sequence. In the boot sequence just put the "Removable Devices" to boot before you hardrive, like this it will try first to boot from your flash drive, otherwise It would boot your hard drive and would never boot the flash drive.


#5 - Testing It #####

Reboot/Start your PC with the flash drive conected, it will boot it up and stop at a DOS comand line. Here to execute Grub4Dos, just type:

> grub

this will execute grub and present it's menu, that should have the following options:


Hirens Boot CD(9,615)
Windows 7
CommandLine
Reboot
Halt


the first two as you can guess are the ISOs, just select the one you want and it sould boot up, and that's it.


Note: the ISOs in order to boot should, be made from bootable CDs or DVDs.

Booting ISOs is still an experimental feature in Grub4Dos, and sometimes It migth not work deppending on how the ISO was created.


An alternative method, to boot an ISO from a USB Flash Disk (PEN), can be found in this Blog here