Location of LR cache?

Hello.
I may have made a bonehead move. In an attempt to increase efficiency and speed in LR and PS, I purged the cache, which I know is wise to do occasionally.
I thought it would make sense to locate the cache on the same drive as my photos.
I use Windows XP Pro, 32 bit, and have 2 internal drives. The C:\ (250G) is for OS and programs, the D:\ (500G) is for photo storage and scratch.
In the LR preferences/file handling, I moved the cache to D:\.
I noticed some comments in various topics here, some saying leave them in the same drive as the catalog. I'm unable to determine which drive that is......where the program is or where the photos are?
Also, I attempted to reverse the relocation, and in the pref/file handling, trying to navigate to: "C:\Documents and Settings\name\Local Settings\Application Data\Adobe\CamerRaw\Cache". After 'name', 'Local Settings' is not an option. i.e., I am unable to follow the stream to the 'c' location where it originally was located.
First, did I make a bonehead move, and second, if so, how do I reverse the move?
Otherwise, with the set-up I have, what would be the recommended configuration.
Many thanks from a computer idiot!
Barry

On partitioning drives, here's a quote from the Premier Pro forum (video editing really hits hard on disks, so video people have a long experience of how to get the best out of disk set ups.
NEVER partition a disk. You may ask why? First of all, it does not increase disk space, it just allocates the space differently. However, the major drawback is that for a partitioned disk the OS must first access a partition table at the beginning of the disk for all accesses to the disk, thus requiring the heads to move to the beginning of the disk, then when it has gotten the partition info move to the designated area on the disk and perform the requested action. This means much more wear-and-tear on the mechanics of the disk, slower speeds and more overhead for the OS, all reducing efficiency.
and a couple of other related suggestions
Use at least 3 different physical disks on an editing machine, one for OS/programs, one for media and one for pagefile/scratch/renders. Even on a notebook with one internal drive it is easy to accomplish this by using a dual e-SATA to Express card connector. That gives you an additional two e-SATA connections for external disks.
: Spread disk access across as many disks as you have. If you have OS & programs on disk C:, set your pagefile on another disk. Also set your pagefile to a fixed size, preferably somewhere around 1.5 times your physical memory.
LR works like video editing in many ways, so setting up as if for video editing always works for me. The big difference being that LR doesn't use the graphics card for rendering (mores the pity) so having a powerful graphics card doesn't help as it does with video.

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