Access Software Raid "Array"

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I have 1 Seagate 7200.7 S-ATA connected to the Promise OnBoard RAID (on Asus P4PE). I had to create one "Raid 1+0" Array in the controller's BIOS. I have installed the drivers in windows, created partitions and so.

Now: How can I access the partitions on the Seagate in Linux? (Kernel 2.4)
I read some pages and searched the forum, but no topic really covers how to access a disk where there are already data on. Can anyone help me?