Hello, I was wondering if someone might give me a hand. I have a multiboot drive I maintain and I am trying to add the ESXi installer to it. It seems well documented that VMWare uses their own mboot.c32 file which is built from not the same code in SYSLINUX mboot.c32 3.86 . I'm using the Syslinux 6.04 from the Ubuntu repositories. I have compiled Syslinux 3.86 . I thought I could try to load the older version of syslinux by chainloading it. This is what I have in the config: COM32 chain.c32 APPEND FILE=/ESXi/syslinux syslinux is the compiled 3.86 binary. I get : "WARN: The sector won't be mmapped, as it would conflict with the boot file. Booting...." It just hangs there. I am doing this in good old BIOS mode. Can you guys shed any light on the error and give me some indication of what documentation to read next? Is this even possible? Thanks, Max