My indoctrination into the world of the MacBook Air (in 2008) went something like this: "Wow, what a great, thin Apple subnotebook, it's the Mac of my dreams!" This was shortly followed by a shocking dose of reality "What do you mean the SSD is only 64GB? What am I supposed to do with my music and photo libraries?!"
Here's my live blog of the 2008 Macworld Expo keynote where Steve Jobs unvelied the original MacBook Air from a manilla envelope.
If that sounds like you, you're not alone. Sure, SSD's are wicked fast and light weight but the tradeoff is that they're notoriously expensive and most people buy models that are too small.
It isn't hard really. 1TB mobile hard drives can be had for as low as $85 (which works out to 0.082/GB) meanwhile a decent 480GB SSD will set you back around $770 (or $1.60/GB -- an almost 20x premium!).
I purchased my 2011 MacBook Airs (13 and 11-inch) with smallish 256GB SSDs and later updated them to larger (and faster!) 480GB models, the problem was that my expensive OEM Apple SSDs ended up in a drawer after the upgrade.
MacSales/OWC has finally released the product that I've been begging them for since the day I stuck my first SSD in a drawer -- a tiny, bus powered enclosure for orphaned SSD sticks. Enter the OWC Envoy ($49.95, 0GB). It's exactly what I was looking for in an SSD enclosure, something small and that I can toss into a bag without weighing it down (and without the extra bulk and inconvience of an external power supply).
The Envoy looks like the MacBook Air itself, a sleek wedge of aluminum measuring 5.9 x 1.79 inches and weighing just over an ounce and a half. As an added bonus it comes with a USB 3.0 port (which is backward compatible with USB 2.0) so it works extra fast with the 2012 MacBook Air.
I use mine with a 256GB SSD that's the exclusive home of my iTunes library and I'm going to set up a second Envoy soon to house my swelling Aperture photo library. At $50 the Envoy is absolutely essential if you've got an orphaned MacBook SSD.