Hi and welcome to the forum
I moved this thread to the blank media forum
Rather difficult to answer, but is not infrequent that something has a very high price. The only thing easy to say is that Ridata discs are not worth the money :disagree:
Only Verbatim discs proved to be reliable about DL discs, so I suggest to get them instead of Ridata.
I'd rate these discs 0 (zero) :bigsmile: