I had an external hard drive by SimpleDrive that I used with my Macbook. I upgraded to MacBook Pro and decided that I would buy a portable hard drive because I was tired of needing a power source for my laptop's external drive. Anyways, I decided that I was going to use the External Drive with my wifes computer which is a PC and went to disk utility and reformatted it for FAT32. Now, for some reason, the PC nor the Mac recognizes the drive when it is plugged in. It has power, but that is all that it is showing.