Using grubinst to install GRUB4DOS on a USB flash drive. The version is grub4dos-0.4.4-2008-08-08. Then copy grldr and GRUB.EXE to the root directory of the USB flash drive. The computer can be successfully booted. The reality is that the RAM-FDD boot is successful. But I found that the boot menu is the built-in menu, not my own written menu.lst. Of course, importing the built-in menu is possible, but modification is troublesome. I want to use MENU.LST. Please tell me how? Also, ask how to determine the drive letter after the USB flash drive is booted? The FDISK LS commands can't be used. After ROOT, it shows FD0. After changing the drive letter in the menu to FD0, it says no. Using the relative path SET ROOT can't find the file I placed.
