The CPU usage test measures the percentage utilization of the CPU (central processing unit) at various read and write speeds (1x, 2x, 4x, and 8x). The results are displayed in the CPU usage area, to the right of the graph.
| Read Speed |
The read speed of a drive is a factor of the speed that the laser needs in order to read the data on an optical storage medium, e.g. 8x or 16x speed.
| Write Speed |
The write speed indicates the speed at which a drive can write data to the optical storage medium, e.g. 8x or 16x speed.