Originally Posted by
Innaflap
Thanks PPL-Hobbyist
I used to do IC design when the Nimrod project was ongoing many years ago in So and GaAs and I haven't thought much about FETs in a long time! The media is almost certainly NAND memory.
What I was explaining is that depending on the technology used - FAT32 for example - that recording loads of the same noise will not take as much room (maybe 10%) as a chatty cockpit and that therefore voice files that have been tagged in the file table as deleted may not have been overwritten. If so, they may be recovered.
It's quite a mute point to be fair, because given the advances in technology if you're going to revisit the black box (and I think AF447 and MH370 prove there's at least a need for an updated spec, even if the cost-benefit analysis doesn't include retrofitting) then you'd include enough non-volatile storage per box to take many many hours of recording (along with other things such as an extendable, floating additional antenna).