Secure data extraction from computing devices using unidirectional communication

A method of storing data from a plurality of industrial devices, the method comprising:

• connecting a micro data capture device, via a first universal serial bus (USB) interface of the micro data capture device, to each of the plurality of industrial devices at different times;
• while the micro data capture device is connected to each of the plurality of industrial devices, extracting, by a data capture side of the micro data capture device, respective data from each of the plurality of industrial devices, thereby defining extracted data;
• transferring the extracted data from the data capture side to a data storage side of the micro data capture device over a unidirectional communication connection between the data capture side and the data storage side, the unidirectional communication connection arranged in a loop;
• storing the extracted data in a flash memory on the data storage side of the micro data capture device;
• filtering, by the data storage side, the extracted data from the data capture side by removing content from the extracted data, thereby defining filtered data, wherein the data capture side further comprises only a volatile memory such that no other memory resides on the data capture side, the volatile memory comprising data that is lost from the data capture side when power is removed from the micro data capture device;
• and
• during each of the different times that the micro data capture device is connected to the respective industrial devices via the first USB interface and during each of the different times that the micro data capture device is connected to a storage device via a second USB interface, re-loading an operating system of the micro data capture device on the micro data capture device.