Get a Solid State Drive (SSD)
The latest and greatest storage device is called a Solid State Drive or SSD. It uses flash memory in place of a mechanical hard drive’s spinning platters, which means, among other things, that there are no moving parts.
Another benefit is that they perform most operations at up to twice the speed of mechanical drives.
The bad news is that they’re expensive — five or more times more than a mechanical hard drive with the same capacity. That said, many users report it’s the best money they’ve ever spent on an upgrade. I’m definitely getting one in my next Mac.