A big THANK-YOU to Zxian, nmX.Memnoch and those who responded, as I found your detailed replies to be most helpful! I was rather impressed to receive such prompt assistance from my first post. Obviously these forums are the place to go for up-to-date information. getting back to my RAID scenarios ... I like Zxian's idea about keeping the OS, software, pagefile, temp files, etc. on a separate RAID1 or RAID0. I do have a pair of 320G SATAII Seagates that I could possibly devote to the OS and Program Files RAID. Perhaps the best use for my 3 500G drives is to mirror 2 of them as RAID1, and leave the 3rd 500G for backups. I am worried that without a dedicated RAID controller, I might not benefit from configuring the 3 500G drives as RAID5. I am still trying to install (integrate using nLite) the proper Intel RAID/AHCI drivers for ICH8R prior to installing a slipstreamed copy of WinXP. There is limited documentation about when you enable the BIOS option to RAID or AHCI, as in BEFORE or AFTER you have those drivers installed. I think I am finally getting somewhere, but that is slightly off-topic. nmX.Memnoch does seem to favour the RAID10 setup, and why not with such a balance between redundancy and performance. My only issue is that can my on-board ICH8R controller make any of this happen? I am starting to doubt if it's even worthwhile to consider a RAID5 array that uses the motherboard's controller. I think given that fact, I might try to stick to using a RAID0 setup for 2 drives for my OS, Program Files, etc. (I save disk images often) and then consider a RAID1 for 2 of the 500G drives with the 3rd one used for backups. Does this seem reasonable? Can my P5B-Deluxe on-board RAID controller support these two options (2x320G as RAID0, and 2x500G as RAID1), but more importantly, will there be a noticeable hit on performance with this scenario? I am able to get clean all of these drives with an external hard drive, so there won't be any issue of having important data on any of these drives during a RAID setup. I would start fresh with empty drives. I just thought of something... What about disk partitions? Are these irrelevant in a RAID0/RAID1 setup? I typically have my drive divided into several partitions (C:WinXP/Progs, D:Pagefile, E:Games, F:MyDocs, G:Backups, H:Installers, G:Downloads, H:Music, I:Pictures, J:Temp, etc.) Does this have any impact on a RAID array? Will these partitions simply be striped or mirrored when created across the other drive? Can I create a RAID0 or RAID1 using a disk that has already been partitioned, or do I need to start from scratch, and partition the RAID drives once the RAID is built? Many thanks again for your prompt and detailed replies, and I look forward to hearing your thoughts on my latest questions. Oh and Zxian, I am from Ottawa.