How Fedora sees previous (now deleted) disk partitions ?

[Bruno Costacurta]

Hello,

my PC has three disks. 
Two of them where previously configured as RAID1+LVM which I removed.
Using fdisk I created other partitions and already installed other distros (to 
test and try them).
I already installed Debian and Gentoo and works fine (I have a single /boot 
partition shared by all distros via GRUB loader).

My problem :
now I'm trying to install Fedora-9 on a specific partition (simply like I did 
for the other distros) but the Fedora installer continues to see previous 
RAID1+LVM, not what is reflected by fdisk (and correctly grabbed by the other 
distros)

My questions :
Where does Fedora grab its partition tables ?
How to modify / correct partitions if fdisk is not enough for Fedora ?

Thanks,
Bruno