[AFreeBird]

I know from experience that these devices are integral to the car's computer. Disabling it would also disable the car.

Reprogram it.

Or don't disable the box, disable the sensors feeding into it.

[Ben Mugged]

Reverse engineering the software in auto computers is difficult but doable. There are several companies doing that today in order to allow users to reprogram timing and engine control parameters. Eliminating the recording function would be possible. However, I would suspect it would be both expensive (reprogrammers cost as much as a new computer 4-600 dollars) and possibly illegal. Tampering with or disconnecting safety systems in a car carries a hefty fine and in some cases jail time.

[Ben Mugged]

The sensors are things like anti-lock brakes, throttle position, and speed. Disable the sensors and your anti-lock brakes don't work, your car will not accelerate, and your speedometer doesn't work. These are integrated systems, meaning they are interactive.