I don't know, because I don't know anything more than you about this. It would seem, though, that the media (disks) some CD-R vendors are selling on the market are something less than desireable (i.e. persistant). That's my guess anyway, given that CD-R information storage is based on some kind of material phase-change, as opposed to the rather more persistant physical storage mechanisms (however subsequently vulnerable) employed by mass-manufactured DCs and vinyl records.