Apparently you can, but I'm skeptic doing a fresh install today, and since I use an SSD, I thought the name "Macintosh HD" would not be very fitting. Maybe "Macintosh SSD" would be better. I also have a normal hard drive in my Mac Pro bay, so that will be renamed in "Macintosh HDD" so I don't confuse them. What's the best way of doing it? People say that renaming it in the info window or on the desktop is alright, is it true that I don't need to use Disk Utility or some app of some sort?