If the raid you are using a controller that came on the motherboard or cost under $100, it is probably a fakeraid controller in which the bios only assists the OS for some raid functions. To get it working you will probably need to install dmraid

Here's a snippet from the Ubuntu site that I found when trying to install it on my Raid1 box.
"What is fakeRAID?

In the last year or two a number of hardware products have come on the market claiming to be IDE or SATA RAID controllers. These have shown up in a number of desktop/workstation motherboards. Virtually none of these are true hardware RAID controllers. Instead, each is simply a multi-channel disk controller that has special BIOS and drivers to assist the OS in performing software RAID functions. This has the effect of giving the appearence of a hardware RAID, because the RAID configuration is set up using a BIOS setup screen and the system can be booted from the RAID.

To install Windows to a RAID device, must supply a driver floppy to the setup process so Windows can access the RAID. Under Linux, which has built-in softRAID functionality that pre-dates these devices, the hardware is seen for what it is -- multiple hard drives and a multi-channel IDE/SATA controller. Hence, "fakeRAID".

Scope/Applicability

If you have arrived here after researching this topic on the Internet, you know that a common response to this question is, "I don't know if you can actually do that, but why bother -- Linux has built-in softRAID capability." Also, it's not clear that there is any performance gain using hardware fakeRAID under Linux instead of the built-in softRAID capability; the CPU still ends up doing the work."

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The smallest drive I have is 80GB and I have no where else to put it so I might as well use it.

I'll take a look at this. It sounds much less complicated then doing it with RAID.