If you are trying to create a bootable USB and encounter a prompt for an , you are likely dealing with a Syslinux bootloader requirement. This file is a critical core component used to boot Linux operating systems from FAT-formatted drives. What is ldlinux.sys?
ldlinux.sys is the main bootloader file for the Syslinux project . When you make a drive bootable, the Syslinux installer alters the boot sector and places ldlinux.sys into the root directory. At startup, the computer's BIOS loads this file into memory to parse configuration files (like syslinux.cfg ) and launch the Linux kernel. Why You Need to Download It Rufus/Syslinux 6.04 - User Support - Qubes OS Forum ldlinux.sys download