what i think you're talking about is a dual boot on the same drive, so if you partition that drive with one partition for windows and one for linux then the only way that they will be able to see each other is if you format them with FAT 32, because both operating systems are able to read that file system. if you are talking about 2 separate drives then it gets sort of annoying because you have to go into your BIOS every time you want to switch between operating systems, but you will still be able to read both if you use FAT 32.
i have been working a lot lately and i haven't had time to install mandrake again yet, but i will post any tips i find when i do.
edit: its sort of early here and i am not fully aware yet
but i think i just realised what you were talking about when you said "see it" and you should be able to get mandrake to recognise the sata with a little work. i did have a little time to look at that site that was posted by Emmanuel_uk and it does look possible! you might have to switch to 2005 edition but like i said it does look possible