SCSI em for cd-r

I hope this is an easy one.I have a cd-r that is IDE and I need the load the module for SCSI emulation .I'm using A P4 2.4mhz Went to Yast2 to change the kernel I'm using Standard Kernel 2.4 optimized for pentium The other choices I have are Kernel 2.4 for i386(use also for 486) Kernel 2.4 for older processors pentium class Kernel 2.4 with SMP Kernel 2.2 with SMP Which one should I use? Is there anything tricky I should be aware of doing this kernel change Thanks