Dan Schwartz, The Times Of Israel
http://www.businessinsider.com/hackers-could-acquire-sensitive-data-through-monitoring-hard-drive-noises-2016-8
PITA, the Portable Instrument for Trace Acquisitionattack, which uses electromagnetic wave detection equipment (available at any computer hardware store) that could “read” the electromagnetic pulses emanating from a standard laptop’s keyboard, including the keystrokes used to de-encrypt secure documents.
The new attack, called DiskFiltration, does something similar using the acoustic signals emitted from the movement of a computer’s hard disk drive (HDD).
One way to beat air-gap attacks, according to the researchers, is to switch to solid-state drives (SSDs), which have no moving parts and therefore emit no noise. However, according to the researchers, “despite the increased rate of adoption of SSDs, HDDs are still the most sold storage devices, mainly due to their low cost.