Memorex sources their media from many companies, like CMC etc. So, one batch of this
DVD+R 8X might be identified CMC, while another might be of Prodisc in origin for example.
Not an entirely reliable media in my opinion. Some folks may have no problem while some
have learned a lesson.
What is the media id code of the Memorex that is causing you focus/tracking problem?
I use only Ricoh, MCC, and TY, and have yet to encounter the dreaded focus/tracking
error. I am on firmware A111.