For anyone who may be considering doing what I was asking about: it can be done.
1. Install boot drive to SATA1 connector.
2. In BIOS, set IDE Configuration to RAID.
3. Save changes and exit BIOS.
4. Boot from Windows CD.
5. Press F6 and follow on-screen instructions to install Intel ICH7 32bit RAID driver (made previously on a floppy using the mobo CD).
6. Complete Windows installation.
7. Install the other two drives to be configured in RAID 0 to SATA2 and SATA3 connectors.
8. Reboot and press Ctrl I (for those who don’t know, and I was one of them not too long ago, Ctrl I is Ctrl “eye”) to enter the Intel Matrix Storage Manager Option ROM Utility.
9. Follow on-screen instructions to set up RAID 0.
10. Go to Windows, Start, Control Panel, Administrative Tools, Disk Mangement, and follow instructions to initialize, format, and assign a drive letter.
The steps above were not clear (to me, at least) from reading the mobo manual. I arrived at this sequence through a combination of discussions with people on various forums, friends, Asus technical rep, the store where I bought most of my components, the manual, and thinking about it.
The bottom line is that my setup now includes one non-RAID boot drive, and a RAID 0 data drive. And it works!
Note 1: The P5LD2 Deluxe has four SATA ports: According to the Asus technical rep, SATA1 and SATA2 are Master, and SATA 3 and SATA4 are Slave. I connected my boot drive to SATA 1, and my two drives to be configured in RAID 0 to SATA 2 and SATA3.
Note 2: The Asus technical rep told me that I could create my setup only by installing the boot drive to the single SATA_RAID2 red connector on the motherboard located near the I/O connectors. I would first have to install the Silicon Image 32bit SATA Driver Disk. After talking about this to the store person, who also installed a setup like mine, I ended up doing it the way described above. It is interesting that the Asus technical rep did not propose the setup as it was actually done.
Hope this helps anyone who wants to do the same thing.
Not all those who wander are lost.j.r.r. tolkein