[mziporen]

You have used the term "reflectivity", and then you ask what is "reflectivity". I suppose that it means how good can a cd/dvd drive read the information written on a CD or DVD media.
NERO has a good program that can test the quality of reading from a written cd or dvd disk. (it stops working if you enter a blank disk to the drive!).
The program is called NERO DRIVE SPEED. It is included in NERO 6 tool kit.
Among the rest, it can make a surface scan on your disk and show damaged or bad sectors on the disk, it shows the percentage of the damaged/bad sectors, and while working it shows the read speed at each sector of the disk.
I think it is also a free ware program. If you need help, please send an email directly to my mail address.