I need to setup a RAID 0 system utilizing 3 250 gig Hard Drives for video back-up. I would like to add a seperate 120 gig Hard Drive to utilize as a system and programs drive. Is this possible??

sort of, you will have 1-120 gb disk/partion 1-130 gb disk/partion and 1-250 raid 0 disk/partion. raid 0, (also known as disk mirroring), requires equal size on each hdd, that leaves you with the extra 130 off the first hdd. you said video backup, wouldn't it be better to use dvd-r for that, if it's just for backup and not serving up video across the net. If this is on a machine with a hardware raid controller then you'd be better off with raid 5 on all hdd's, then you'd have 500 gb for whatever on just 1 drive/partition.

I thought Raid 0 was striping mode. That is what i need to do to maximise the amount of data storage. I need to have about 750 gigabytes for on- the-fly video back-up. I need to store appoximately a months worth of surveilance video. I would like to use 3x250g HD in Raid 0 to give me 1 partition of 750g and would like to use 1x120g HD for O/S and programs on an idividual IDE channel, separate to Raid. Can this be done??

AFAIK, this should be possible, and not too difficult to set up. First, install all the drives in the computer. You could even have the 4 drives on only 2 IDE channels, but if you have a hardware RAID controller, I'd go with that. Next, install the O/S and applications on the 120 gig. Then go into Administrative Tools, and click on disk management. Click on the drives you want to make into the RAID 0 and where it gives the drive info (on the left), not the volume info (on the right), right click on each one and tell it to make Dynamic or something like that, can't remember for sure, but I think that's it. Then you can setup those 3 250 gig drives as one 750 gig volume using Disk Striping. That should do it. HTH. -Jon