installing debian alng with fedora
 

i'd like to try debian distro on my pc. i have a second hd (20gb) i can reserve for it but i'm afraid that after this installation i won't be able to boot from my fist disk(cos' it already happened to me installing mdk9.1). i suppose that it is a issue related with the corret use of grub. how can i manage the bootloader configuration in order to avoid useless risk and enjoy both of my linux distro?

Seeing as no one has replied I'll give you my thoughts. When you get to either the Lilo or grub installation do NOT action it. Make sure you know the details of the disk # partition # and kernel and initrd.img for the new Debian system and go edit your existing grub with these details. This is what I do.

first of all thank you very much for repling. i was thinking i made a question too silly to be replied. isn't so?
to follow your suggestion, where i can get the infos?
thanks again

Grub starts at 0 so if the drive is your second master (drive 3) and the partition is 1 then the format is (hd2,0). Note you use the format drive#-1 and partition #-1. Lets use my entry as an example;
title Debian GNU/Linux, kernel 2.6.3-1-k7 (recovery mode)
root (hd2,0)
kernel /boot/vmlinuz-2.6.3-1-k7 root=/dev/hdc1 ro single
initrd /boot/initrd.img-2.6.3-1-k7
savedefault
boot
the hard drive is 3 and partition 1 (hd2,0) the rest is self evident from the above.