ty jaclaz and blub
i have tryed with the fat32 on a huge 160gb ntfs hd
after the fdisk execution.. first scan.. after this.. and the prompt for use or not all the disk (obv i say not) another scan of the whole disk.. after this.. i have turned off the pc: it was a bit slow
isn't' there a chance to use.. for example a trick for the recovery console? (it starts but it doesn't execute the winnt.exe file

)
i think that the command prompt is better versatile for a multiboot disc , but unhappy there's this issue

the method reported in this forum seems to be pretty complicated and less versatile
ty again for any further suggestion