Probably a simple solution here that I am just missing... I plugged my usb drive that has my stuff from my old windows machine into my mac pro and I can read and transfer my files to my internal HD's, but I can not write to it. The usb when plugged in was named back up.. maybe I did, but I dont remember ever labeling it Backup? The error message I get is "items can not be moved because backup can not be modified". I right clicked on the drive to change permission settings but couldnt find anything like that... your help is much appreciated.