I have similar problem recognizing Sandisk 16 Gb micro cruzer in windows 7 computer. I can see it in disk management but it will not let me format it. I can read other sandisk cruzer drives in this windows 7 computer and the one micro cruzer I can't read in windows 7, I can read in vista and xp computers. I was able to reformat the drive in an xp machine and then I could read it in the windows 7 computer and I could also write to it. However, that only lasted a few days and once again I can no longer read the micro cruzer in windows 7 computer although I can read it in other computers ( vista and xp). Any thoughts or suggestions. Oh yes I have other sandisk micro cruzers that read and write fine in my windows 7 computer. I am running the release candidate version 7100 of windows 7 from May 5th and it does update fine.