In the early days of aviation, we actually did have devices that were capable of recording flight data, but these devices were devoid of the crucial voice recording feature that the devices of today have. Moreover, these little gadgets could be used only once. A small voice recorder, which David spotted at a Trade show, paved the path of inspiration. Warren then put together a magnetic recording device which was erasable & re-recordable. In 1957, the first batch of this device, were manufactured. This was called the “Flight Memory Unit”. It used solid steel foil and recorded 4 hours of Voice & Instrument data. A Black Box, is a combination of Flight Data Recorder (FDR) & a Cockpit Voice Recorder (CVR), is quintessential for Air crash investigators, but faced a lot of critique from the Aviation Industry who feared, it would bring up Privacy issues.