So if "legacy support" is enabled, it lists both GPT disks and MBR disks. The BIOS Boot Menu lists those devices that are bootable in the current mode. To boot Windows 10 on the GPT disk, I need to use the separate BIOS Boot Menu (note: this is NOT the panel in the BIOS that specifies the device boot order). The BIOS is set to boot from the SATA SSD, and BIBM allows me to select which of several operating systems on the SATA SSD I want to boot, but I cannot boot the copy of Windows 10 that is installed on the GPT disk. (2) 2TB 2.5 inch SATA SSD that has an MBR, contains the BIBM partition, and boots in legacy mode. (1) 128GB M.2 NVMe SSD that has a GPT and boots in UEFI mode. > copy of W10 that came on the laptop and boots in UEFI mode. > I did wonder whether if I changed to MBR mode whether I could ever boot the I would guess that this applies to the BIBM memory stick. Other memory sticks can boot in only one mode, because they contain only the boot files for that mode. The Windows 10 installer is like this, because the Windows 10 installer contains the boot files for both modes (so the installer selects the correct files for the mode). Some USB memory sticks can boot in either UEFI mode or legacy mode. > this change does the laptop recognize a USB stick with Bootit BM. The Bios can be changed to "Legacy Mode", and only if I make
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