Only two hard drives - optimal file locations?

Hi,
Can anyone tell what would be the optimal file location configuration (regarding perfomance) when there are only two physical hard drives available? One is abviously running the OS (Windows XP), but how to locate raw images, ACR cache and catalog-files for optimal performance (and are there any other file locations to consider from LR point of view)? The search did not provide answer to this question, and with google everything pretty much boils down to having (at least) three physical hard drives or RAID-array, which are not an option for me.
The workstation can have only two internal drives but allows dedicated controllers for both of them, and I would prefer not to have external drive (only USB2 and FW400 connectors available). Memory is already maxed for the current mother board, and disk activity seems to be next place to optimize. The current performance is "ok", but it would not hurt to squeeze a bit more.
Running Windows XP and LR 2.3.
Thanks in advance.

Thank you for your advice. It has been quite a pain to find out credible setup hints for simple two drive setup.
This slightly differs from original topic, but...
Have there been more inprovements within 2.4 code than have been mentioned in release notes (e.g. http://thelightroomlab.com/2009/06/lightroom-24-and-adobe-camera-raw-54-available/)? I have currently no need for additional camera support, and the bugs mentiones as "fixed" have not been a problem for me. I have had some cases with inconsistent plug-in behaviour (and few crashes) with export plug-ins, but I have judged those as problems either with SDK or plug-in itself.

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It seems that there are actually two hard drives inside, one in A, and one in B (see photo)! So, if this is the case, I don't have a problem with the two hard drive icons.
I guess if a G5 shows two hard drives on the desktop, then there's two hard drives in the machine!
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Console > Disk ### Status Size Free Dyn Gpt ZTIDiskpart 12/16/2013 9:57:05 AM 0 (0x0000)
Console > -------- ------------- ------- ------- --- --- ZTIDiskpart 12/16/2013 9:57:05 AM 0 (0x0000)
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Console > ---------- --- ----------- ----- ---------- ------- --------- -------- ZTIDiskpart 12/16/2013 9:57:05 AM 0 (0x0000)
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Only two hard drives - optimal file locations?

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