Cdspeed and drive support

Hello. I have some question. I have buy this morning an asus e616p2 drive to replace my msi 1812, to scan my burned dvd and recover data of poor quality media (an31). After very strange results on previously tested media i decide to buy (this afternoon) a liteon sohd-167t02 drive. No i obtain of first scan with msi drive. My question was :

Why average scanning on asus e616p2 was 64.00 ECC ???
On liteon it was 1.22

You can precise this strange behaviour on drive list of cdspeed.

If someone can explain me that. Thanks for your response and sorry for my bad english