There are many entries ready made by default after installing MultibootISO.
#Grub4dos boot install#
Replace $num_cyl and $last_sector with the appropriate values.ġ2) This should do it… To clean up just remove the ‘usbtemp’ folder. After install MultibootISO into pendrive/External Hard Disk, it support for booting many OS or programs. We use fdisk to set up the geometry of the device and make the first partition. The last sector of the first partition is 1*255*63-1 = 16064. Now, copy the grldr file from your GRUB4DOS 0.4.4 (it is newer than the one included in 1.0. The boot partition only has to hold the ‘grldr’ and the ‘menu.lst’ file, so we set its size to 1 cylinder (or a little less if we take the first 95 boot sectors into account). Choosing ext2 as the boot filesystem hides it from windows systems, and makes the second fat32 partition visible.
#Grub4dos boot iso#
Last_sector = num_cyl*255*63 - 1 = 2008124ĥ) We’ll make two partitions: a small boot partition with a ext2 filesystem and a second fat32 (or ntfs) partition to hold the iso files. Using grub4dos to boot Ubuntu Ubuntu 18.04 ISO disk image, here is the entry for the file MENU.LST: title Ubuntu 18 fallback 6 find -set-root /iso/ubt1804.iso map -heads0 -sectors-per-track0 /iso/ubt1804.iso (0xff) map -hook root (0xff) kernel /casper/vmlinuz file/cdrom/preseed/ed bootcasper iso-scan/filename/iso/ubt1804.iso. Here we’ll use the standard 63 sectors/track and 255 heads, so to calculate the number of cylinders and the last sector of the last cylinder, do the following: We’ll be using command line linux applications to reach our goal, any distro will do.ġ) Find the path to your usb device, here we’ll use /dev/sdbĢ) Optionally, to erase the usb device, issue the following commands as root:ģ) Note down the size of the device in bytes:Ĥ) To make fdisk happy, partitions must end on cylinder boundaries. On the boot menu for the flash drive, there are two directories besides the default boot to hard drive and Help. lst for grub4dos) appear to have many of the same things in them. The config files in both (.cfg for syslinux and. We’ll install grub4dos as boot loader, using the ‘triple mbr’ feature to increase the compatibility with different mainboard and BIOS configurations. Inside there, there are two more directories named grub4dos and syslinux.
Addendum: If you do not want to use Grub4DOS and want to revert to your Linux Grub2 bootloader, you can use a rescue disc to boot into your other Linux. Only takes a few seconds and existing data is unaffected. This means you can just download almost any bootable iso and boot it without having to burn a cd or unpack the iso. Thats it Grub4DOS should now be working on your updated 32-bit Ext4 partition. The goal is to make a universal bootable usb device with a small boot partition and a data partition on which we’ll store the iso files.