Hi, I've recently purchased the Panasonic DMR E55 and I have a pack of 10 DVD-RAMs. They work fine but now I'm finding that I'm losing track of what's on what disc. I have some CD/DVD pens but they're permanent. Can you buy wipe-off ones ? The manual recommends against using labels as it could affect the balance of the DVD when rotating. I'd be interested to hear what others do. Thanks !