I wanted to burn recovery discs so I could use the recovery partition to install Ubuntu. The HP recovery media disc creator encountered an error on successfully creating the second disc. However, it still wanted me to burn disc 2. I needed to increment/skip this disc.
Looking at the recovery partition, the file hp/CDCreatorLog/ResumeSnapshot.xml holds some interesting settings, particularly ResumeSetNo. (As well, the preload/base.wim file is about 18 to 19 GB and apparently the imagex tool can deal with it.)