For ministerial archives, the firm has requested a test of the best media and Blu-Ray recorders. This test, everyone can see it. Search on the web "quality recordable blu-ray disc for archiving." This test thus reveals that for blank Blu-Ray is that Panasonic is far ahead, with Sony pretty close. The others are far behind (Verbatim, Maxell, JVC ...). For writers, it's that serious Pioneer best. LG followed and Buffalo. Personally, I am very satisfied, no worries except recently with BD-RE ... but I question my PC ...