Only comment the variable, here is the explanation:

docker
#-------------------------------------------------------------------------------

#Name : FROM_LOCATION_CD_LABEL

#Datatype : String

#Description: This variable should only be used in multi-CD installations. It includes the label of the compact disk where the file "products.xml" exists. The label can be found in the file "disk.label" in the same directory as products.xml.

#Example: FROM_LOCATION_CD_LABEL = "CD Label"

#-------------------------------------------------------------------------------

FROM_LOCATION_CD_LABEL=<Value Unspecified>