Hi, got a new iMac osx 10.7 and linked my MyBOOK Essential 2TB external hard drive to it. Everything works fine and I can access all my external files from the drive on my iMac. My big problem is a long as Ive had it I cannot figure out how to transfer any files from the iMac to the external drive and Im slowly running out of space on my iMac now and need to transfer. I was told its as easy as click and drag but that does absolutely nothing, it just docent transfer anything. What am I doing wrong here? How hard can it be? I did use the ext drive previously on my windows system if this has any baring on this problem but as I say it is connected and I am able to access the old files on it just can't transfer new ones..