I bought these rewritable disc's based on the other reviews and the price. But they don't work on my Philips DVD recorder.I have another make of disc, and they work fine. I contacted Philips about this and they could only suggest using another make of disc.This all seemed very stange to me. As even a high street shop couldn't advise,I searched on the internet for an answer, and I think I found it. I didn't know or realise that there were different types of discs.Some recorders will only recognise DVD-RW OR DVD+RW NOT BOTH.My recorder seems to only recognise the DVD+RW version. These Verbatim DVD-RW discs work fine on a friends Panasonic recorder. Hope this helps.