I have a Seagate FreeAgent Go Media external hard drive. It worked fine for months and then I plugged into my friends mac and it worked for a few minutes then gave me an error message saying that I unplugged it. (I didn't unplug it) Ever since the icon is not there for me to access the data. I have tried disk utility on two other macs besides my own and they all do the exact same thing. It recognizes the hard drive and when I run first aid it says the volumes appear to be ok. I unplug it and plug it back in put it doesn't show up anywhere except disk utility.