![]() Otherwise (with, for example, Ubuntu), the kernel will not be able to locate the SquashFS root file system to continue booting.Sometimes, things might go wrong, and you end up with a half-flashed drive that is unusable by your operating systems, and common graphical tools might even refuse to get it back to a normal state. However, an extra step is often required for most Linux distributions: the file system label is often used to identify the disk from which to boot, and therefore, the file system's label must match that which came on the ISO file. The rest of the ISO may be extracted to the same partition, and this is what tools such as Rufus does. The contents of efi.img must be extracted to a folder called efi on the target disk, such that boot圆4.efi appears at the path /efi/boot/boot圆4.efi on the root of the disk. The new partition must have the ESP type, and must be formatted as FAT32. You can create an EFI System Partition using GNOME Disks, GParted, or command-line tools such as gdisk. The drive is rejected by the firmware, because it does not believe the disk to be bootable. Therefore, the system firmware does not recognise this file as a valid EFI System Partition when it is copied to your USB drive. from GNOME Files, the file manager), the EFI partition is maintained as a separate efi.img file, but this is actually not how the disk is arranged on a CD/DVD burned from this ISO file. This means the same disk can be booted by a legacy BIOS, or modern EFI-based firmware, in their respective boot modes. Most Linux distributions, Ubuntu included, now distribute an El Torrito-compliant disk image. Some BIOSes can (apparently) also boot from NTFS file systems. X86-64 EFI-based firmware loads the bootloader by looking for a file called /efi/boot/boot圆4.efi (case does not matter) on a special, FAT32-formatted partition with type 0圎F or EFI System Partition (ESP) on the selected boot disk. You will be able to enable legacy BIOS support in the system firmware's setup utility, though this may differ on other laptops, and could be subject to change for newer laptops. ![]() I assume your HP Z-Book is new enough to be both x86-64, and support EFI boot. There are two different boot methods in use today on x86-64 platforms, the modern EFI and legacy BIOS boot. The location where the bootloader is stored is dependent on the method used by the firmware to boot the disk. It is stored on the disk in a specified location where the firmware can find it easily. The system firmware does not to know how to boot the operating system on the drive, and instead passes on that responsibility to a small program called the bootloader. Therefore, the system will not be able to boot from this disk. ![]() Tl dr When you recreate the ISO from the extracted files, you are not (correctly) transferring either the BIOS bootblock, nor the EFI System Partition, or ESP, to the newly created USB drive. If in UEFI mode on installed system, boot into the Target drive and run the above.Īnother method to make a bootable USB is to boot ISO files directlyīIOS/UEFI Template Image for Booting ISO Files Sudo grub-install -boot-directory=/mnt/boot /dev/sdx ![]() Install grub, if in BIOS mode or booted from USB drive run: sudo mount /dev/sdx2 /mnt Linux /casper/vmlinuz file=/cdrom/preseed/ed boot=casper quiet splash - persistent Open the ISO's folder as Administrator, open the ISO using Archive Manager.Įxtract the ISO's contents to the Target's root partition.ĭrag and drop the boot and EFI folders from Archive Manager window to the EFI boot partition.Įdit sdx2/boot/grub/grub.cfg adding set root=(hd0,3) after the first line that starts with menuentry.Īdd a space and the word "persistent" after.
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