A firefighting or rescue apparatus includes a frame having a cab defining an interior within which a flash memory device is permanently mounted. The flash memory device is isolated so that it is incapable of receiving any onboard operating data pertaining to the operation and status of the firefighting apparatus. Instead, the device primarily stores data regarding a service manual, maintenance manual, electrical diagrams and/or troubleshooting guide related to the firefighting apparatus. The device is able to be selectively coupled to a portable computing device so that a user working on the firefighting apparatus can access the data without risk of loss or misplacement thereof. A related method also is provided.