The invention relates to a device for data storing with a compression coding andor decoding device for the storing of picture data in a compressed or decompressed data format in a data memory. In one aspect, a method for an access point for monitoring, caching, and advertising service information on a wireless network is provided. Inferences as to types of advertisement pertinent to the user location, event, etc. The flow of cooling air in the cooling air circuit flows through at least one cooling bore which penetrates a section of the rotor shaft.