After about a month of waiting, I finally obtained the Thunderbolt-to-FireWire adapter I needed to transfer data from my old PowerBook G4 to my new rMBP via FireWire target mode. Although the transfer speed has been horrible (200 MB per hour), the adapter is working as advertised, as I'm slowly but surely recovering data from my old, dead PowerBook and getting it onto the rMBP. However, I've been having a troubling issue: If I lock my rMBP's screen while the old PowerBook is connected via FireWire, the rMBP's screen has twice refused to wake up/unlock. The first time, I physically disconnected the adapter and the screen became responsive, but today I had to do a hard reboot. (The keyboard would light up, but the screen remained black no matter what I tried.) What does this sound like? A software glitch related to the Thunderbolt-to-FireWire adapter, or a problem with my rMBP? I'll probably never use this adapter again after I finish transferring my old data, but it's still disconcerting. I hope this is just a hiccup related to old technology (FireWire) rather than a sign of problems to come with my rMBP. Any ideas? Thanks.