I stumbled on a very interesting post recently talking about a new piece of research done by Alfredo Ortega revealed at a the Ekoparty security conference in Buenos Aires, Argentina.
It's not accurate yet to pick up conversations. However, there is research that can recover voice data from very low-quality signals using pattern recognition.
I didn't have time to replicate the pattern-recognition portion of that research into mine. However, it's certainly applicable. For that reason, I would not discard that additional data like voice could be recovered in the future.
Mechanical hard drives cannot read or write data to the platters if significant vibrations are present. Instead, the hard drive monitors vibrations, like those created by speaking, and operates during the periods of low amplitude oscillations.
Since software can monitor hard drive operations with high frequency, it's possible to build a profile of the vibrations the drive was exposed to. This can, theoretically, be used to derive the sound, and with high enough accuracy it could be possible to even retrieve conversation.
See this video demonstrating a hard drive "listening" to a song playing nearby:
The fundamental piece to this research is in the way hard drives must react to vibrations. If the vibrations were long-lasting enough, it would be possible to delay drive operation for arbitrary periods of time, and this is exactly what Ortega demonstrated.
Called a "HDD resonance attack", it's possible to completely disable the drive by blasting it with low frequency sound that causes constant vibration. Ortega demonstrated this form of denial of service (DoS) attack using a 130Hz tone that caused the drive to stop responding.
The Linux Kernal disconnected it entirely after 120 seconds
Check out the short video showing the attack off:
Official source
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