No. of Recommendations: 2
I've been toying with the idea of offering SSD upgrades for my clients who want to squeeze more performance out of their aging Macs.

So as an experiment, I replaced the 160GB spinning drive in my family’s 2007 MacBook Pro with a 120GB SSD. (There was less than 50GB in use, so 120GB is plenty.)

Well, the machine absolutely flies. It boots up in half the time, and apps now only bounce once when launching.

I'd love to do the same upgrade on my personal 2009 MacBook Pro, but I have about 400GB in use on the 500GB drive, and it would cost me about $400 to buy an SSD that's big enough.

So instead I'm thinking about making a home-built Fusion drive. I can buy a 120GB SSD for about $100. For another $15 I can buy a bracket that let's me mount it in my Mac's optical drive bay. That leaves me without an internal optical drive, but I don't really need it. (For another $15 I can buy an enclosure that lets me convert the optical drive into a USB external optical drive.)

Then I'll need to do so Terminal voodoo to convert the two physical drives into a single Fusion drive. This doesn't require any special hardware — support is built-in to Mountain Lion. (Though only the command-line version of Disk Utility has the features necessary to create a fusion drive.)
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