No alarm feature but I do have a disc lock. Have used it when traveling to keep anyone from moving the bike. Mostly used in the motel parking lot. Like noted, if your motorcycle is targeted by "real" thieves, they will just pick it up and take it.
Mine is a Master Lock brand, but they all seem to be similar. Do check the size of the pin to make sure it fits a hole in brake disc. Not sure if this is the one I have but it looks like this
http://www.amazon.com/Master-Lock-8303DPS-Disc-Brake/dp/B0009V1WR0
