My experience is very bad with these BD-R LTH discs that my writers refuse to use. In addition, a study of the Archives of France shows their bad behavior in time. They are a bit cheaper than the HTL models but these are much better. See below an excerpt from the conclusion of the tests carried out by the Archives de France: "The BD-R LTH type models can not be recommended to date for archiving digital data because the two models arrive evaluated last. for both accelerated aging in an oven and held to the light. On this last point it should be noted that even when BD-R LTH models are less sensitive to light than most DVD ± R models. The BD-R HTL, meanwhile, can be considered almost insensitive to light. "