Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy Memorex BLACK CD-R's

Just so you know, I bought these with the assumption that they were the silver disks listed in the picture above but I received the "Black" version and about the only thing I can use these for is recording music for music CD players and my HP 820 burner. That's it. It writes data to the disk fine, reads fine in the burner but when I try to read it in a another desktop or notebook w/o a burner, it cannot read the CD in data or audio format. I've used the silver version of these CD-R's and they work great on all my CD devices.