I believe what the default setting depends on the type of hard drive. It appears (to me) that all the wd green drives are set to a default of 8 sec. This apparently gives maximum power savings, but with a cost of theoretically decreasing the drives life span. Seems that the black drives will have a default of disabled. Makes sense. I get the feeling from the following video that it is probably just best to disable the idle timer of wd drives. Note that for some drives(most newer), "disable" actually results in an idle timer setting of 3720 sec (62 min).