I'm creating a Windows 7 install USB device through the Boot Camp Assistant and the process is painfully slow. At first I thought it was my flash drive so for an experiment I tried just copying the ISO over to the flash drive. That seemed to go fine at a decent speed. However when it's actually creating the USB install drive it would seem to go at about 100 kB / second. I would stay in the folder and watch the size of the "install.wim" file go up very slowly, probably at a rate of less than 500 kB / second. I looked at Activity Monitor and it seems that my Data Read rate is hard-capped at 1 mB / sec, while my Data Write speed is capped around 200 kB / second. Could this be why? What would be the cause for those limits? I am using a base Retina MBP.