Need help creating universal multiboot 'fixed' USB
Posted 05 April 2017 - 05:35 AM
My idea is to set up hybrid MBR with 2 partitions: ESP and exFAT. I'm hoping someone here has done this or similar. I'm comfortable using any cli tools including dd and gdisk and editing boot entries for grub2, syslinux, or grub4dos. I haven't learned yet how to (chainload?) from the exfat partition.
I am not fond of booting an iso file from grub or BCD. I am open to all suggestions otherwise.
Posted 05 April 2017 - 09:34 AM
To support Secure Boot, you would need either Windows bootmgfw.efi or grub2 (x64 only).
If you use bootmgfw.efi (as \EFI\BOOT\bootx64.efi) then I am not sure how you would UEFI-boot to Parted Magic from that?
So the alternative is to boot to grub2 and then from there boot to pmagic or WinPE.
If your WinPE wim file is less than 4GB, then only a single FAT32 partition is required.
Once you have secure booting working, getting MBR-booting to work should be easier.
You would need signed grub2 boot files for Secure Boot (eg. from a Ubuntu ISO).
Posted 05 April 2017 - 12:37 PM
Posted 05 April 2017 - 05:36 PM
EFI or GPT partitions are not required for UEFI-booting from a USB drive.
Just a simple primary FAT32 partition is all that is needed.
To perform a full UEFI installation of Windows, Setup.exe insists on GPT partitions, but for any other boot purpose, GPT is not needed (or even desired!).
Posted 05 April 2017 - 06:09 PM
Edited by x79, 05 April 2017 - 06:12 PM.
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