I have previously used such DL from Verbatim without even a single failure. Since Verbatim however this no longer produces with 2.4x speed and my Sony RDR HX 1010 HDD recorder only supports up to 2.4x, I was glad when I could order the Memorex blanks. Did the same to me can get 2 spindles. When I started the first attempts, I was flabbergasted. The first 7 pieces that I tested could not read my Sony all. There is always an error message appeared, most 'dirty disc'. After the 7 attempts I gave up in exasperation. All I can not say other than 'great frustration' because now I'll be able to use any DL blanks more for my records from HDD recorder ... Unfortunately I had awarded 1 star because otherwise a review is impossible, the product has made I believe, however, hardly deserves.