I searched for awhile on a specific thread for running a VMware Fusion 6 virtual machine of Windows 7 on a MacBook Pro Retina 13" off of a Micro SD card. Here is my setup: MacBook Pro Retina 13" Core i5 2.4 GHz 8 GB Ram 256 SSD Here is the Micro SD card i am using: http://www.amazon.com/gp/product/B00DM1BDPK/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1 My results with running my Windows 7 using VMware Fusion 6 from the Micro SD have been great. Quick start up and shut down of Windows 7. Programs launching and closing quickly. I am going to be putting this Micro SD into Nifty Mini Drive so it is seamlessly integrated into the MacBook Pro. I am assigning 1 GB of RAM to the VM and I have made the hard drive size 30GB of my 64GB micro SD card. I have also shut off hibernate to save battery life and have ran disk cleanup after the SP1 upgrade of Windows 7 to clear hard drive space in the VM.