For the past XX years, consumers were told that CD/DVD disks would last for, at least, thousands of reads/writes. Not so anymore. I'm currently running Windows XP Pro-32 bit. And the only brand that will work on my System is Memorex. I've tried other brands, but they always screwed up on either reads or writes. Memorex is the only brand that will work on my System. I've noticed within the past few years, that they only last for about 4 or 5 reads/writes. And then the disk becomes a "coaster". The RWs are good for data that changes. The recordable disks usually last a while.