Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I thought they were good...but one year later

I am copying a pile of discs after originally burning about a year ago. All went fine until I hit the Philips. Now I had copied these about 4 or 5 months ago and they were fine. Now 3 out of 5 failed with errors. I am wondering if thelong term storage properties of these are compromised.They do play fine in DVD players, but wonder how long that will be if secotrs are going bad.