Installing the Second Instance After the installer loads, selecting the "Custom: Install Windows only (advanced)" option is necessary. Another common problem is the GRUB bootloader being overwritten by the Windows installer, which prevents the menu from appearing.
Dual Boot Windows 10 Media Creation Tool Guide
Maintaining and Optimizing Dual Systems. The setup process will copy files, expand compressed files, and install features, automatically handling the boot configuration data (BCD) to detect the previous installation.
To prevent this, it is best to change the letter of the new installation’s system partition to a temporary value (such as E:) before completing the setup. Managing the Boot Menu The boot menu, displayed for a few seconds after the PC is powered on, is the interface that allows selection between the two Windows 10 installations.
Dual Boot Windows 10 Media Creation Tool Guide
File System and Drive Letters By default, Windows assigns drive letters dynamically, which can lead to confusion in a dual boot environment. Creating the Installation Media To proceed, you need a bootable USB drive containing the Windows 10 setup files.
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