Even where it works, speakers are much worse microphones that dedicated microphones, and so the amount of data that can be gathered is low. Why bother when you probably have a microphone on the same PC that can capture far more sound?
I think there was a long period where a proper PC would frequently have only the cheap stereo speakers which are small enough to far outperform raw microphone leads. But I'm not sure this works that well in >=HDMI even if some monitor speakers might otherwise be ideal.
It's probably done to keep it in a low powered state and reduce the initialization delay. Maybe also to prevent the Windows USB plugging sound from playing upon turning the camera on, as it would seem weird to the user ("I don't have any USB devices plugged in...")
They shouldn't have been in the point of impact in any case, so the root cause was something way before the impact, and cannot be seen on the video. Above in this thread is a link with the ATC recording, in which the pilot gives incorrect readbacks, indicating a typical CFIT where they just assumed all is fine until the last second when they tried to maneuver out of this. Hence the obvious surprise. The video seems to show they hit something at the tree top or streetlight level after the last second pullup/dive/bank/whatever that maneuver was.
The amount of hidden state modern hardware uses is humongous, it's infeasible without abstracting it in a VM. I remember some Win9x software that would let you save the process state to disk and restore it later, but even in that much more primitive era it was hit and miss.
It says he learned about it in the 90s, information about distant parts of the world was much harder to come by back then, particular regarding Soviet countries (at least for Westerners)
The attempts I've seen at this are usually in support of a corporate data classification and retention policy and are pretty hard to pull off successfully. The attempts I've seen usually involve adding metadata or tagging the data either manually or using automated classifiers.
(you also need to plug the speaker directly, mostly limiting it to headphones and laptop speakers)
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