Recently I bought a couple of Verbatim's DVD+R x16 packs on spindle in a new wrapping (which looks like the ones on http://tinyurl.com/yp6a89, except that pack's base looks different, as Japan-made packs). Media type is YUDEN000 T03, MIJ.
Till now I used Verbatim's DVD+Rs x16 in an old packaging (same media type, also MIJ), and though scans weren't great, they were fine - usually there were 20000-30000 PIEs (max 20) and 1000-1500 PIFs (max 7-8). But with DVD+Rs in a new packaging error rate is a complete disaster: DVD+Rs from one of the packages contain PO failures, and DVD+Rs from the other package "just" have much worse error rate. Here is a couple of examples (all the burns were done at x8 speed):
From a bad pack:
And here are the scans from a "better" pack:
Also, here is a typical scan from an old pack:
The question is, why DVD+Rs from the new packs are so bad? The only thing that had seemingly changed is the wrapping...
Also, can I somehow improve the burn results?
And the last question: even though the scans for DVD+Rs from the bad pack are so bad, the disks are still perfectly readable (md5 sum computes fine). How can that be - doesn't PO failures mean that the disk is unreadable?