The delivery was quick and easy! The problems began only at the burning! Nachhdem my otherwise use anywhere 50GB - blanks (MediaRange MR509 BD-R DL blanks (6x speed, 50GB, 10)) were almost gone out and I desperately needed a replacement for a quick erledigendes project, I ordered these blanks as they were the fastest available! The project that I wanted to burn should be done in triplicate. For the first Blu Ray I had a proven by my blanks and burning proceeded smoothly, but from the second Blu Ray I had to fall back on these blanks, but after exactly 56% were concluded with the message "Invalid address for write" , A mistake can happen even once, so I thought there yet, but also the second blank, came to 56% exactly the same error message! Seems as if not addressed, the second layer in the writing operation! So I moved that further burning, but reappointed my proven blanks and lo and behold, it worked again everything smoothly. These blanks I complained and I will better stockpile with the proven slices future!