I have been using the above portable hard drive on my Mac desktop computer. I wanted to use it on my new MacBook Air to transfer over some data on DVDs. However, I get the error message that the hard drive requires being plugged into a USB drive. I used the appropriate Apple converter which converts you from a USB cord to the cord that goes into the MacBook Air. Apparently this is not appropriate. Do I really have to buy a new portable hard drive just for the laptop?