Johan has a nice post over on his new blog talking about the default partition method in MDT and a nice workaround for when working with VM’s.
As you most likely know, MDT 2010 by default partition the drives "slightly" different than the normal Windows 7 setup. MDT creates the bitlocker (BDE) partition in the end of the drive, and the Windows 7 setup creates it in the beginning.
So, big deal? Well it can be…. If you are for example deploying virtual machines for VDI, you often request disk space in a SAN, which can be expensive. If you request say only 40 GB per VM, and later want to extend it, you can’t because the BDE partition in the end prevents you from it…….
Read the rest of his post linked above.