Does slowing down the burning speed on a CD/DVD give you better/more reliable recordings?
Slower burn speed often makes poor media usable.
Taiyo Yuden is the #1 for DVDs, MCC discs are next best. MCC is a manufacturer and can be sold under several brand names. I have some Verbatims which I bought recently that are MCC. Here's my source: http://www.best-dvd-burning-software-reviews.com/best-blank-dvd-media.asp
I bought some Imation discs that were CMC and the first 5 or so worked, the rest had calibration issues and went into the trash.
CD discs don't need to be great media to work, but some may last longer than others in storage.
no. Most bad burns are due to defective media. (aka a bad disk)