I have a PC that is all SATA, including the DVD drive. I prefer to set the SATA controller for AHCI for the bit of extra performance. However, build 7000 will not install from the DVD drive set like that. So I changed the SATA controller to IDE and was able to install build 7000. I then manually changed the SATA driver
to AHCI, rebooted and changed the SATA controller to match. That works, of course. With build 7057, however, I was able to perform the install with the SATA controller set to AHCI. A nice improvement.
I also noticed two other things. The magical 200MB hidden partition is now 100MB, and I think I saw a speed improvement copying HDD to HDD. At one point I saw 130MB/sec copying back files to the C: drive (new 500GB Hitachi) from the V: drive (year-old 750GB Seagate). This PC has an ancient 3.2 GHz P-4 on a new motherboard.