Setting up scratch raid drives in Premiere 2

I have next configuration of hard drives for HDV editing:

1. two 200gb in raid 0 sata drives (windows xp x64 and programs)
2. two 400gb in raid 0 sata drives (storage)
3. one 120gb ata drive (scratch drive for windows)

Now we have next files in Adobe Premiere 2:

Project files
Captured Video Video files
Captured Audio Audio files
Video Previews Files
Audio Previews Files
Media Cache Files (what is it for??)
DVD Encoding Files

If my captured files located on one drive, then should i render to different drive or all of captured files stored in media cache files and then i have to render on different drive where media chache located?

Sorry, i'm lost.
 
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