Yeah you have confused me too.
the 166S is a 16x48x dvd drive.
Compared to other liteon DVD drives of different revisions you might see some minor differences, but for proper reading of copy protected cd's its much better to use a cd-rw drives.
They can handle things much better.
I have both a liteon DVD and a 48x24x cd-rw.
I use the dvd for reading dvd's, standard game installs, audio cd playing and the like.
The burner does all the burning and reading of "tricky" media
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