I have 20 discs out of 100 discs now and 10 0f discs were defective. It can make a difference that every other hard drive is defective. Looks like a production problem. Discs are supplied without a spindle. They are fully supported by shrink wrap. Handling them after the shrink wrap is released is a nightmare. All in all, it's not significant as it seems. especially if a pattern with 50% defect remains on the remaining 80 discs! Be careful or you might get what you pay for.
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