A pair of articles from Macworld seek to remove the confusion from Apple’s Fusion Drive.
Macworld Investigates the Fusion Drive -- Apple’s new Fusion Drive — a combination of a standard solid-state drive and a normal hard drive — is an interesting beast, promising most of the performance improvements of an SSD along with the capacious size of a hard drive at a reasonable price. James Galbraith of Macworld extracts the Fusion Drive from a new Mac mini to discover exactly what Apple has done. Be sure to read the comments (from the bottom up), where readers are sharing useful information.
Make Your Own Fusion Drive -- Macworld has posted an article by Albert Filice explaining how to create your own Fusion Drive from a normal hard drive and an SSD. It’s not difficult if you’re comfortable working in Terminal, but be sure you have full backups before you start, because the process will erase both drives.