Whats Inside?

WD External Drives External Drives for Mac
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FW 800 isn’t 800 MegaBytes per second, it’s 800 Mbits or about 75 MBytes per second.  The ATA 133 hard drive can run as fast as 133 MBytes per second.  So, I guess according to specs the internal hard drive isn’t the problem.  If I know anything about Final Cut Pro, you should be running an internal drive as your scratch drive.  I doubt any external will work, unless it’s a thunderbolt drive.