Installing windows 10 to external lacie rugged thunderbolt drive

[vagos1103gr]

hi anybody knows which is the best way to install windows 10 to my external I have problem to install windows 10 to my external lacie rugged thunderbolt 500 gb tb drive. I have the imac5k. I install first with the bootcamb and after I mirror it in my external lacie drive with winclone. It boots normally but after couple reboots doesnt. I try different rtm version but the problem remain. Anybody has this problem? Maybe the bootcamp drivers is not ready yet for windows 10 from apple! I also after I copy the win10 to my external I erase it from the internal with the bootcamp. I tried also to boot to the efi but I can't I get an error.