You've got a shiny new SSD-equipped machine, but you're wondering just how fast that SSD really is. Disk Speed Test from Blackmagic will give you a quick, straightforward answer.
It's incredibly easy to use. Disk Speed Test writes large chunks of data to your chosen disk and then reads that data, giving you a real-world read/write speed in MB/s. The program then tells you what kind of uncompressed video that drive will be able to handle and allows you to save the results as a screenshot.
As you can see from the image above, my magnetic hard drive-equipped MacBook Pro isn't going to win any speed awards. It also couldn't handle anything above uncompressed SD video according to the app -- but then again that's not the sort of thing I would even dream of trying. If you're looking to capture uncompressed video direct to a disk, Disk Speed Test will give you an indication of whether it's going to be up to the job.
So, if you're curious about your hard disk speed, regardless of whether it's just a simple magnetic hard drive, an internal SSD, a network mounted disk array, or even a beast of a Thunderbolt SSD drive -- Disk Speed Test will quickly and easily answer that for you with just one click.
Blackmagic's Disk Speed Test is available for free from the Mac App Store.