Evgeniy, Thanks for the feedback. I will change the id to be a hex number, ie "236cdc1c00000043\n". (Qoute about the thermal attribute 'w1_slave') > I would like to create this files automatically by w1 core and only > let slave drivers to create it's "private" files themselves. I'm curious as to why. I've looked at types of families out there (http://owfs.sourceforge.net/family.html). As far as I can tell, only a few of them are thermal class. Do we really want a generic name 'w1_slave' that means something different for each family? I removed 'w1_slave' from the core because w1_therm is the only family that uses it. IMO, the core should only create entries for attributes that are applicable to all families. The only attribute that is present for all families is the 64-bit id. Thanks, Ben