Ok guys here is my situation:

Currently:

IDE 0 Master: 30 Gig 7200 RPM
IDE 0 Slave: 15 Gig 5400 RPM
IDE 1 Master: 15 Gig 5400 RPM
IDE 1 Slave: DVD/CD-Burner

IDE 0 Master has Windows 2000 installed + program files etc.

IDE 0 Slave and IDE 1 Master are Software RAID-ed to form one 30 Gig drive.

Now I recently aquired an ATA 66 PCI card and would like to put IDE 0 Master on that card.

That would then require me to change IDE 0 Slave to Master. However I have this funny feeling that is gonna screw up the RAID.

How would I go about upgrading this?

well...
why not set the burner as a master in IDE 0.

Try it out and if it works...you can leave it.

I would do it this way.....BACKUP data to the OS Hard Drive that is on the ata66 controller (by placing the ide 0 master as the dvd/burner)and then try moving them around....if it fudges you can re-create the array then place the backup back onto the new raid array, then that way you shouldnt loose any data (assuming you are striping and not spanning, with spanning you wouldnt loose too much data).

Raid kinda bothers me too about that. I have never switched around the assignments, but i have the promise fastrak 100 and it is also software driven.


note:
Also make sure to change bios boot settings. I believe that my bios uses "SCSI DEVICE" to enable me to boot from the raid array on the add-in card...im sure itll be all in the ata66 manual.
:P