When the built-in SSD in his MacBook Air failed, Macworld’s Dan Moren decided to try replacing it himself (surprisingly, at the suggestion of an Apple Genius). The process was easier than he thought, taking only 20 minutes. He explains what he did, and walks you through how to restore your data with SuperDuper, including a pointer to a handy utility that restores Mac OS X’s Recovery Partition. follow link
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Constant Dictionary Definitions
If you hold down Command-Control-D in a Cocoa-based application that supports AppleSpell, you'll see little dictionary pop-ups for each word that you mouse over. Neat, eh?
How to Replace a MacBook Air’s SSD