Kernel Config question

Not sure if is the right place for this question.
On kernel config:

Code:
# ATA/SCSI peripherals
#device		scbus		# SCSI bus (required for ATA/SCSI)
#device		ch		# SCSI media changers
device		da		# Direct Access (disks)
#device		sa		# Sequential Access (tape etc)
device		cd		# CD
device		pass		# Passthrough device (direct ATA/SCSI access)
#device		ses		# SCSI Environmental Services (and SAF-TE)

da, cd & pass, need scbus & ch to work properly or have nothing to do with that? I am asking because the are on the same section. I have no scsi controller on my mobo (Asus P5K3 deluxe) but I have da & cd (My system recognize my usb flash as da0s1 and my dvd-drive as cd0)
 
The entries with a "required for ATA/SCSI" comment are required for USB connected devices as they are recognized as such. I believe the "media changer" driver is not required though.
 
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