I'd get hold of the latest version of Redhat then (if you insist on using Redhat - I personally wouldn't ever use it on my computers. I'd go with Gentoo instead, but unless you're willing to do a <i>lot</i> of learning in a short period of time and capable of it, it's not a linux I recommend to someone new to it all). I'm not sure why it's not seeing the partitions - they should still show up as a unknown partitions since they'll be in the partition table anyway. Newer versions of linux have no problems reading them - it's only writing that's still a problem, though that's partially overcome.
How large is the master drive? Also, when you said it saw 30 GB, was that referring to the partition it could see, or the entire disk (it should give both numbers anyway)? Also, is it roughly 30 GB, or is it more like 32 GB? Since I think there's a 32 GB limit with certain BIOSes, preventing them seeing more than that much of the hard disk. If this is the case, you're looking at flashing your BIOS. Alternatively, you might have set the clip jumper on the drive by mistake, clipping it to 32 GB - try double checking the jumpers on the disk too (it should be in the same place where you set it to master/slave).
EDIT:
This thread might be of interest too