How can you say FAT32 is not secure? If he's going to do what i've
done which is put windoze on HD2 and linux on HD1 (or primary ) then
anyone who wants to access the pc has got to get through a router and
firewall - then login into linux. I used two drives as i had them and
did it as i thought it was easier to dual boot like that. On my main
pc i would probably use one disc and put the other into a remote drive
and use for backups.

I take on board what you say about ntfs... but when i asked a similar
question years ago i was strongly recommended to use FAT32 albeit the
limitation of file size. ntfs is more modern and should be used on
larger disks... also it has journaling which is a better bet by far.
Use FAT32 on small disks, SDHC but nothing more. As for reliability...
backup... backup...backup.

This maybe worth reading... but then again look who the author is.
http://support.microsoft.com/kb/100108