Kaspersky Lab on this finding, a Russian company .... A drive firmware hack dating back to at least to 2001 and some indication perhaps to 1996. Effects ALL manufacturers. Stashes data, C&C style infection, in theory applicable to Windows but suspected to have other OS brothern. One found computer in the Middle East infected is Mac OSX. Alleged that this Equation Group software (named for the many encryption algorithms the malware is using) is partner and vector for earlier Stuxnet. "Kaspersky's reconstructions of the spying programs show that they could work in disk drives sold by more than a dozen companies, comprising essentially the entire market. They include Western Digital Corp, Seagate Technology Plc, Toshiba Corp, IBM, Micron Technology Inc and Samsung Electronics Co Ltd." Reuters article: http://www.reuters.com/article/2015/02/16/us-usa-cyberspying-idUSKBN0LK1QV20150216 Kaspersky PDF with much detail: https://securelist.com/files/2015/02/Equation_group_questions_and_answers.pdf Similarly, a 2006 dated NSA interns file describes a drive screw job / related project: "(TS//SI//REL) Create a covert storage product that is enabled from a hard drive firmware modification. The idea would be to modify the firmware of a particular hard drive so that it normally only recognizes half of its available space. It would report this size back to the operating system and not provide any way to access the additional space."