Step #1 - Insert a blank DVD and open Nero StartSmart.
Step #2 - Select Nero InfoTool and wait for information to be collected.
Step #3 - Select disc tab and cross reference ID with information from this digitalFAQ website.
Apparently CMCMAGM01 means that my HP DVD+Rs are manufactured by Taiwan's CMC Magnetics. Second class media discs, I don't really mind that but I'll know what to look out for.
Thanks to Willchua for bringing up this topic in yesterday's blog post!