I'm using windows xp. I currently own a 40gig drive, I'll get a new 120gig in the mail thursday. I've never used NTFS and really don't know anything about it. I will use the 120 as my main drive, because it's faster, and I'll use the 40 if I have a use for it! I know I'm going to need to format at least part of the 120 with NTFS because I need to be able to use very large files. How would you set this up for optimal performance? I've heard different suggestions about partitions for OS, progs, data. Some suggest using fat32 for the OS and or progs and the rest NTFS. Others have suggested using either all FAT32 or all NTFS. What would you do? Thanks!