Welcome to CD Freaks!
1/ Just a reminder for a future, did you notice the announcement at the top of this forum about where CD/DVD burner questions should be posted?
2/ In any case, each disc has an identifier that tells the drive information about the disc, like what kind of dye is used and who manufactured the disc. If, based on this information, the drive thinks that the disc is low quality, it will restrict the burn speed. Use better quality media... most name brand media should work just fine, and if you're in the USA, then the various weekly special sales at Best Buy et al. will usually bring some of these name brand discs down to a reasonable price.