Where to put system, samples, audiofiles, if 4 harddiscs available?

I´m sure this has been posted, but my search result was too big and I could figure out, just to look for thread-titles:
I´m looking for the best way to organize my G5 2 Ghz dual with 2 internal harddiscs, 1 external SATA-drive for 2 harddiscs and 1 firewire 400 external drive.
I´m using a lot of VSL/VI instruments, Trilogy, Atmosphere, Stylus RMX, Ivory and Symphonic Choirs.
1. Which files should not be on the same drive?
2. Is the system getting faster, if I just install system and programs on the system drive? (I often get "system too slow"-messages in logic)
3. Is it faster to make a Raid of 2 drives and put my whole VSL-Library on this raid or spread it to 2 independent drives.
4. Is it o.k. to put audio-files and sample-libraries on the same drive?
G5 2 GHz Mac OS X (10.4.9)

Felix,
You could certainly do that, and it would probably work just fine.
The reasoning for keeping separate drives for audio and samples, as I have always understood it, is in the world of mega-sample libraries, such as VSL, there is a lot of sample "streaming" taking place. The initial attack of the sample is loaded into RAM, but as you sustain a note, say from your violins, the sample player, be it the Vienna VI, EXS, Kontakt, etc, then goes and grabs the sustain portion of the note, as needed.
It's my understanding that if your song is streaming audio from your sample drive, as well as audio from your audio drive (like vocals, for instance), Logic is being called upon to play audio from two different audio sources. If these sources or "pathways" are separate, performance can usually be satisfactory, and predictable.
But if these audio sources are scattered among the same drive, there is a greater likely hood that problems could occur, because Logic is trying to read files from several locations, but from within the same hard drive "platter".
In reality, I don't know how crucial this all is, but it makes some sense.
Another reason, for me at least, is that with sample libraries, you tend to load them onto your hard drive, where they pretty much stay put. Whereas an audio drive, you work on a project till it's finished, then archive the audio files, and remove them from your audio drive, to make room for the next project(s).
If this writing, removing is occurring on the same drive your samples are stored, more file fragmenting is likely to occur, which over time, will indeed slow down the disks performance.

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