Well, blank CD is CD-R? Am a little conservative and take only brand goods from Sony or other manufacturers for years. This pack of 50 had been consumed within a short time and I have found neither loud rattling by imbalances (with poorly centered hole) still write or read failures. In my estimation, this CD-R is for data, easy and safe to use music (CD format) or MP3 (no failures). The plain white top is to make excellent personalized (also from my children when they make their own individual radio play CD graphically). Technical data (write rate) do not interest me more because I am on the reliability of this Sony CD-R (also in not "inkjet" -Konfektionierung) leave for years - I was previously disappointed in this case no once.