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Apple Insider reports that a developer on Wednesday revealed that the Fusion Drive support built into OS X Mountain Lion is compatible with a makeshift hybrid storage device



In a post to Tumblr, developer Patrick Stein unofficially confirmed that Mountain Lion provides Fusion Drive support for current Macs, as he was able to "build" a hybrid drive compatible with Apple's new storage technology.

When Apple announced its new Fusion Drive hybrid storage solution alongside the redesigned iMac earlier this month, it noted that OS X Mountain Lion would be able to operate the system without the need to update. This prompted some to question whether existing hybrid drives would work with current Macs not configured with Apple SSD and HDD combination, as the statement suggested support for the technology was already embedded in the operating system's code.
  OS X Mountain Lion confirmed to support Fusion Drive on legacy Macs