CarFax For Used PCs: Hewlett Packard Wants To Give Laptops New Life

HP is developing a 'PCFax' system similar to CarFax for used cars that securely collects and stores detailed device usage and health data at the firmware level to extend the life of PCs and reduce e-waste. A team of HP experts outlines the system in a recent IEEE Spectrum report: The secure telemetry protocol we've developed at HP works as follows. We gather the critical hardware and sensor data and store it in a designated area of the SSD. This area is write-locked, meaning only authorized firmware components can write to it, preventing accidental modification or tampering. That authorized firmware component we us is the Endpoint Security Controller, a dedicated piece of hardware embedded in business class HP PCs. It plays a critical role in strengthening platform-level security and works independently from the main CPU to provide foundational protection.

The endpoint security controller establishes a secure session by retaining the secret key within the controller itself. This mechanism enables read data protection on the SSD -- where telemetry and sensitive data are stored -- by preventing unauthorized access, even if the operating system is reinstalled or the system environment is otherwise altered. Then, the collected data is recorded in a timestamped file, stored within a dedicated telemetry log on the SSD. Storing these records on the SSD has the benefit of ensuring the data is persistent even if the operating system is reinstalled or some other drastic change in software environment occurs. The telemetry log employs a cyclic buffer design, automatically overwriting older entries when the log reaches full capacity. Then, the telemetry log can be accessed by authorized applications at the operating system level.

The telemetry log serves as the foundation for a comprehensive device history report. Much like a CarFax report for used cars, this report, which we call PCFax, will provide both current users and potential buyers with crucial information. The PCFax report aggregates data from multiple sources beyond just the on-device telemetry logs. It combines the secure firmware-level usage data with information from HP's factory and supply chain records, digital services platforms, customer support service records, diagnostic logs, and more. Additionally, the system can integrate data from external sources including partner sales and service records, refurbishment partner databases, third-party component manufacturers like Intel, and other original equipment manufacturers. This multi-source approach creates a complete picture of the device's entire lifecycle, from manufacturing through all subsequent ownership and service events.

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