Why isn't my mac reading all the files on my external hd?
First off, I should say that this is my very first Mac, so while I've had iPods and an iPad for awhile, this is all pretty new to me. I have a refurbished Mac Mini from 2011 with a 2.3GHz intel core i5 and 8 GB of memory. The OS is Yosemite 10.10.3. I have everything I used on my old PC on an external hd. My new-to-me Mac Mini reads some of the files on there, but not all of them. In particular, hundreds of music files. What do I do to find them again? I have not tried any troubleshooting steps because, as a total newbie, I was worried that doing things on my own would only result in some sort of tragedy. Can anyone help me?
Mac mini, OS X Yosemite (10.10.3)