Betwix and between... Yes, I can start linux from SuperGrubDisk, but I still don't know how to do it directly from my HD. I have GRUB in my MBR, but I don't see the loader menu without SuperGrubDisk...
I tried to fix MBR as it shown in this guide
http://www.supergrubdisk.org/wiki/Howto_Fix_Grub "Choose Language & HELP

))" and I have a result: it installed GRUB onto my hda!!!

The worster thing it can do - there are Windows installed with recovery function, so I need this MBR unchanged

Now I need to recover it back, of course. The only one thing I need is to be able to load GRUB from hdb directly and start Sabayon from there...