Bless A Usb For Legacy Boot

GPT is modern and has many advantages over MBR. However, there are also some issues with GPT booting in Legacy BIOS mode. GPT is part of the EFI specification, of course it will work best in UEFI mode. But maybe it will not be compatible and can not boot up on the BIOS computer, see more here. Microsoft also does not support booting Windows on a GPT hard disk in Legacy BIOS mode. However, in some ways, you can still install Windows on a GPT hard drive even if your computer only supports Legacy BIOS mode.

We show you how to create a bootable Windows 10 USB for Legacy or UEFI BIOS with the Media Creation Tool, Rufus, and Windows 7 DVD/USB Download tool. Ryan Maskell-July 3, 2020 4:45 pm CEST.
LibreELEC is compatible with both Legacy and UEFI. The partitions created for LibreELEC are ext4 not GPT. Are you trying to dual boot or have LibreELEC alone in your system? To install just create a bootable usb using the LibreELEC USB-SD Creator from the download page, downloads – LibreELEC.

Directly dropped into a grub shell when boot Ventoy 3. Works fine with a small USB drive(e.g. 32GB) Why no problem with other tools (e.g. Rufus) When you make a bootable USB with other tools like Rufus, the USB drive will be reformatted and all the data in the ISO will be written into the USB from the begginning.

So far, MBR is still supported in both UEFI and Legacy BIOS boot. However, there are several reasons that you must use GPT instead of MBR. You can only create partitions up to 2TB on MBR disks, if you need to create partitions larger than 2TB or the total size of partitions on disks larger than 4TB, use GPT instead of MBR. For 3TB and 4TB hard drives, you can create multiple partitions with full disk space without having to convert the MBR to GPT, see how to partition a 4TB hard drive.

AIO Boot now supports installing Grub2 on GPT disks including both HDD and USB. After installing Grub2, you can boot the GPT disk in Legacy BIOS mode.

Windows Boot Manager does not support booting into Legacy BIOS mode on GPT disks. AIO Boot uses wimboot to do this.

Enable the Quiet Boot option in the Main Menu. Under the Advanced menu, ensure that the Legacy USB Support option is enabled. In the Boot Options menu, make sure USB Boot Priority is enabled. Ensure the Boot Mode (also known as EFI Optimized Boot) is set to Legacy. This is found in the Boot Options menu. Save the changes and exit. From the firmware menus, boot to drive or network while in UEFI or BIOS mode: On the boot device menu, select the command that identifies both the firmware mode and the device. For example, select UEFI: USB Drive or BIOS: Network/LAN. You might see separate commands for the same device. For example, you might see UEFI USB Drive and BIOS USB.

Install Grub2 with the boot partition

Install AIO Boot to a partition on GPT disks.
The grub-install, grub-bios-setup command on Linux and the grub-install.exe, grub-bios-setup.exe program on Windows require a boot partition on the GPT disk to install Grub2 for the Legacy BIOS mode. On Linux, this partition will be flagged as bios_grub. We will create a small partition of 1 to 10MB. You do not need to format and do not need to mount the drive letter for this partition. For USB, you can use the MiniTool Partition Wizard to create a second partition.
Run AIOCreator.exe, select Grub2 from Bootloaders. The tool will list the partitions that you created in step 2.
Select the partition and click OK to install Grub2.

Install Grub2 without a boot partition

This is a new feature of AIO Boot v0.9.8.1. It supports installing Grub2 on the GPT hard disk to boot in Legacy BIOS mode without creating a boot partition.

Install AIO Boot to a partition on GPT disks.
Run AIOCreator.exe.
Select Install Grub2 (Legacy) from the Tools button. This button only appears when the current hard disk is GPT and the current drive format is FAT32 or NTFS.
Please note that you should reinstall Grub2 every time you defragment on this drive.

Good luck!

AIO Boot now supports installing Grub2 on GPT disks including both HDD and USB. After installing Grub2, you can boot the GPT disk in Legacy BIOS mode.

Windows Boot Manager does not support booting into Legacy BIOS mode on GPT disks. AIO Boot uses wimboot to do this.