I have a 2011 Macbook Pro and an older (5 year old) Western Digital external hard drive. I have always used this hard drive for both mac and windows. Recently, however, whenever I go to transfer a file from the mac to the WD hard drive, the little transfer window pops up and it appears to initiate the transfer. However, it never fully starts it. It appears to "get stuck" in that initiating stage, showing zero of 3.16 gb transferred and shows an unknown transfer time. This happens no matter how long I leave it open. Again, I have used this external hard drive with my macs for the past 5 years without any problems until now. I haven't moved or modified the WD hard drive, so I am not sure what happened or how to solve this problem. Any suggestions?? I appreciate any help you can give me!! Have a great day!