As i've said one month ago, i've started the work to transfer all the cd into hd in flac; a 50-disc robot is a WONDERFUL tool for the job - especially because you can open a 200-cd pack, load a stack then it does rip everything, repeat three times then repack and open another pack; however there were some discs i didn't wanted to go thru the robot for various reasons: MFSL and similar Gold disc release, extra rare Japanese ones, Hybrid SACD and Dualdiscs.
I have no explanation but only a statistic: "Gold" and Japan all ok, Hybrid SACD all ok, Dualdisc... a true nightmare: 4 out of 47 ripped correctly as they should, for 43 i had to go thru Plextor drive and Plextools to recover it at best. Be aware that with Plextools i've been able to rip at least 30 bronzed cd and only on 5 he had serious problems recovering correctly the bytes on the last tracks... it's a great digger combo.
The four good ones were all USA DD, (2 Bon Jovi, Wallflowers and Donnas), vast majority of the 43 were european releases.
Since nearly all the dualdiscs are in "like new" condition (=bought by me sealed, ripped the DVD part then stored) a so high failure rate does surprise me. I know DD is out-of-specs for CD but... this is really too much.
Quality control problem or flawed design from the start? I'm more on the second opinion...