Kickstart RHEL4 via USB in VMware

I am trying to make a RHEL4 image using VMware Workstation 6 with a kickstart installation file from a USB memory stick. I am booting off of a RHEL4 .ISO image for install, and my USB is connected to the VM in the removable devices tab. When I begin the install with the kickstart file, I get to the boot prompt "Boot:" and put in the following command boot: linux ks=hd:sdb1:/ks.cfg it bypasses the procedure and goes right to the GUI install. I then used this command to see what scsi devices were attached to the RHEL VM "cat proc/scsi/scsi" it didnt show any devices. Now heres a kicker, if I change the name of the ks.cfg file ( i added a cfg making it ks.cfg.cfg) I then get an error that says "Kickstart file error, change the syntax and retry). I am hoping I am using the correct boot command and just not using the correct scsi device allocation ie; sdb1 or sda1 etc etc. Has anyone come across this before, and is there something in the command iam missing?

Thanks
Izman