В корне диска есть папка /boot/. В ней лежать ISO образы установщиков и theme.gz (GRUB4DOS)
menu.list
timeout 30
gfxmenu /boot/theme.gz
default 0
title Загрузка с жёсткого диска
find --set-root --ignore-floppies --ignore-cd /bootmgr || find --set-root --ignore-floppies --ignore-cd /ntldr
map (hd0) (hd1)
map (hd1) (hd0)
map --hook
rootnoverify (hd0)
chainloader (hd0)+1
title Загрузка Partition Magic - Работа с разделами жёстких дисков
map /boot/pm.iso (0xff) || map --mem /boot/pm.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Загрузка vcr35r.iso - Тест жесткого диска [Victoria]
map /boot/vcr35r.iso (0xff) || map --mem /boot/vcr35r.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Загрузка mt410.iso - Тест оперативной памяти [Memtest]
map /boot/mt410.iso (0xff) || map --mem /boot/mt410.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Windows Server 2012 R2 Standart Russian
map /boot/ru_windows_server_2012_r2_vl_with_update_x64_dvd_4051130.iso (0xff) || map --mem /boot/ru_windows_server_2012_r2_vl_with_update_x64_dvd_4051130.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Windows Server 2016 ENx64
map /boot/WinServer2016x64_EN.iso (0xff) || map --mem /boot/WinServer2016x64_EN.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Windows 7 SP1 Russian_x64
map /boot/Win7_Pro_SP1_Russian_x64.iso (0xff) || map --mem /boot/Win7_Pro_SP1_Russian_x64.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Windows 10 Pro_x64
map /boot/SW_DVD5_Win_Pro_10_64BIT_Russian_MLF_X20-25757.iso (0xff) || map --mem /boot/SW_DVD5_Win_Pro_10_64BIT_Russian_MLF_X20-25757.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Установка Windows 10 Home/Pro Redstone 1 July 2016
map /boot/Win10_1607_Russian_x64.iso (0xff) || map --mem /boot/Win10_1607_Russian_x64.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Ubuntu 14.04.4 Desktop
find --set-root /boot/ubuntu-14.04.4-desktop-amd64.iso
map /boot/ubuntu-14.04.4-desktop-amd64.iso (0xff) || map --mem /boot/ubuntu-14.04.4-desktop-amd64.iso (0xff)
map --hook
root (0xff)
kernel /casper/vmlinuz.efi file=/preseed/ubuntu.seed noprompt boot=casper iso-scan/filename=/boot/ubuntu-14.04.4-desktop-amd64.iso quiet splash --
initrd /casper/initrd.lz
title Установка CentOS-7-x86_64-DVD-1511
find --set-root /boot/CentOS-7-x86_64-DVD-1511.iso
map /boot/CentOS-7-x86_64-DVD-1511.iso (0xff) || map --mem /boot/CentOS-7-x86_64-DVD-1511.iso (0xff)
map --hook
root (0xff)
kernel /casper/vmlinuz.efi file=/preseed/ubuntu.seed noprompt boot=casper iso-scan/filename=/boot/CentOS-7-x86_64-DVD-1511.iso quiet splash --
initrd /casper/initrd.lz
title Elementaryos 0.4 Desktop
find --set-root /boot/elementaryos-0.4-stable-amd64.20160909.iso
map /boot/elementaryos-0.4-stable-amd64.20160909.iso (0xff) || map --mem /boot/elementaryos-0.4-stable-amd64.20160909.iso (0xff)
map --hook
root (0xff)
kernel /casper/vmlinuz.efi file=/preseed/ubuntu.seed noprompt boot=casper iso-scan/filename=/boot/elementaryos-0.4-stable-amd64.20160909.iso quiet splash --
initrd /casper/initrd.lz
title RemixOS [Android for Desktop]
map /boot/Remix_OS_for_PC_64_B2016012301_Alpha_Legacy.iso (0xff) || map --mem /boot/Remix_OS_for_PC_64_B2016012301_Alpha_Legacy.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title AdminPE - Загрузочный диск системного администратора
map /boot/AdminPE_UEFI.iso (0xff) || map --mem /boot/AdminPE_UEFI.iso (0xff)
map --hook root (0xff)
chainloader (0xff)
title Перезагрузка компьютера
reboot
title Выключение компьютера
halt
