How to multi boot iso files from usb using grub2 iii. Don t specify a partition number.
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Boot usb drive from grub. I am assuming you have an appropriately large usb disk at dev sdzthat you can completely erase for this process. Booting via grub the easiest way to boot from a usb drive is to boot via grub. Toggle the usb drive bootable flag.
If you use the wrong syntax you will receive an error stating installation. Before taking the drive out locate where the. The usb device if it s recognized will probably be hd1.
You can use these instructions to create a bootable usb drive with grub that can run the windows 10 installer. Hold the option key down during power on and select the efi boot option that should be present. 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.
Format the usb drive. Insert the usb drive and boot the system. I used arch linux to prepare my usb device but any linux variant like debian or ubuntu should work.
Just add a closing parenthesis. At the grub menu hit the c key to enter command mode. Re format the flash drive in the usb hdd mode optional if the flash drive is allready usb hdd but it is necessary if the flash drive was used as a boot drive earlier.
Insert flash drive in to a mac. Install grub2 on the usb flash drive. To check if your bios is able to detect the usb drive and hand it over to grub just run grub from your hard drive if it already installed or from a grub boot floppy or cd.
Adding the bootable iso files. Here s how i did it. Install grub on the usb drive.
Create a bootable usb drive using something like startup disk creator. Interrupt the boot process and instruct the bios to boot off the usb flash drive. First you ll want to change to the root directory of your usb.
The usb device should be detected as a mass storage device and treated just like a hard drive. Create the grub cfg file. Install grub2 on usb and hdd from windows run command prompt under admin and go to the grub 2 02 for windows directory that you extracted above.
Further reading write your own grub menu entry. When you get to grub press c to get to the command line option. Flash drive must be formated to fat32 file system and it needs to make active.
Or install windows nt6 mbr boot winpe5 menu only. Set the mbr through bootice grub bootmgr. Cd d c grub 2 02 for windows check the number of hard disk you will install be it usb or hdd.
Mount partition and create folders. The grub screen should appear.