The external hard drive letter is "F", which is in order with the lettering of the other drives on the computer (local disc is 'C', recovery is 'd', dvd/cd is 'E'...). Yes, I'm pretty sure the version of WMP I have is 12, I did mean that I have windows 7. I will manually change the letter and see if that helps. I would prefer not to have to put the music on the computer because there is so much of it (75 GB) . I have about 185 GB free space on my computer, which is plenty, but would it slow it down? Also, it would take forever to transfer it in the way that I know how to do it.