It burned ok with Nero so I'm assuming the capacity is genuinely 700Mb. I'm really not bothered, I'm going to throw the discs away and never use them again. I'd only downloaded and installed the program because you'd said you'd be interested to know what make the discs were. But it looks like without installing Nero I won't be able to find out, so I guess it's not worth the hassle.

Cheers - Callum.