Most RAID systems that run under windows are not true hardware RAID systems but rather they depend on software drivers. And these software drivers seem to always only be written for Windows, not Linux. So unless your RAID manufacturer also provides drivers that can be run under Linux, you are correct, there is no wauy to recover te data that is scrambled over multiple hard disks. Even if there is a Linux driver you would have to be able to install it (not always easy with a Live CD), and it would have to map the drives exactly the same way as the Windows driver does.