A data recorder includes an I/O port, a host processor and a cartridge including a media storage and a media processor connected to the media storage. The media processor includes media capability data which is specific to the media storage. A bus connector removable connects the cartridge to the recorder, and the media processor and the host processor are connected to the connector by a Pathway Bus. When the cartridge is connected to the connector, the media capability data is transmitted from the media processor to the host processor and the host processor communicates data with the media processor as a function of the received media capability data.