making tachometer from dvd writer?

software like Nero tells speed of DVD burner so there must be a tachometer inside it how can i extract tachometer from DVD burner and use calculator screen for displaying results.

lemonie5 years ago

Software like Nero observes the data transfer rate, it doesn't report RPM.
It's faulty-logic that says "there must be a tachometer inside it".

rickharris5 years ago
for example

The tacho is done by talking to the hardware within the drive, the tacho is a very very small part of the software in the drive !

There are MUCH easier ways to do it than that