Instruct: Classify an Amazon review as either positive or negative.
Query: These CD-Rs do not work on my Vaio Matshita drive

I have a Sony Vaio VPCCW notebook with Windows 7 and Matchita DVD-RAM UJ890AS. Bought Memorex 700MB/80-Minute 52x CD-R Media (100-Pack Spindle). I now own a stack of 17 unusable Memorex CD-Rs that failed a disk copy of a simple audio disk, and 3 (three) that succeeded. I'm going to throw this stack out and buy another brand. It was certainly a waste of money and time for me. Too bad I didn't buy from Amazon; I'd get my money back.