So, I installed the DP1 on a second partition of my rMBP's 256G SSD. Upgraded to DP2 when it was available. I'm headed out to SDCC in a couple of weeks, and was planning on repartitioning the drive so I would have enough room to do the iMovie work required of the video I'll take while there. I went into Disk Utility under my Mavericks install, but the ability to change the partition scheme or delete any of the partition is greyed out. Same with the Disk Utility available in the recovery partition. Anyone see what I'm missing something obvious??