Linux doesn't really use letters the windoze does. I'll explain.
Primary Master = /dev/hda
Primary Slave = /dev/hdb
Secondary Master = /dev/hdc
Secondary Slave = /dev/hdd
That is for the drives themselves. Now for partitions.
Prmary Master first primary partition = /dev/hda1
Prmary Master first logical partition = /dev/hda5
Prmary Master second logical partition = /dev/hda6
Note the first 4 are reserved for primary partitions. The ones that are 5 and up are logical. Linux will install on all logical partitions.
There should be a tab to select the other drives. There is in Mandrake and I think Redhat uses the same tool. It should be labeled hda and hdb, depending on how they are connected.
As for the LBA error, you may want to check the settings in your BIOS. You may need to enable Large Block Addressing for that drive. It should be in the section that lists the drives that are connected. Mine is all the way to the right in the listing. Yours may vary.
I hope this bit of info will help a little anyway. Post if you need more help.