Hey guys. So, I'm waiting for my brand new SSD to come. This means a new, beautiful clean install. But I've been pondering the question, which is actually the fastest way to do it? Well, one would think that through the DVD would be the quicker way, but maybe not? As an example, my Unibody MacBook can read DVD's at 16x. If we look at this article about CD and DVD read/write speeds, we see that the average speed of a 16x DVD is a low 21.13 MB/s. So even though the DVD-burner itself is on a 3Gbit S-ATA BUS, it still won't be able to read a DVD any faster than 21.13 MB/s. Let's have a look at the most readily available alternative for most people, the external USB hard drive. Almost everyone has got one now, and it's quite easy to restore an image of the OS X Leopard installation disk onto one. Let's look a the specs! The USB 2.0 bus, according to this article (and as pretty much a general consensus) is 480Mbit/s. If we do the math (Mbit/8=transfer rate in MB) we come up with a nice, round 60MB/s. Now, that's three times as much as the average read speed of a 16x DVD. One would then conclude that it is by far faster to install OS X Leopard from an external USB hard drive. Am I far off here? I've just discovered this and can't really get how an external bus can be three times faster than an internal. If I'm wrong, please explain.