ProRes LT and FireWire 800 GRaid Mini

It's been awhile since I tried to go mobile without an Sonnet F2. I'm on a MacBook Pro 2.66 GHz Intel Core i7 with 8GB of memory. I've converted my footage to ProRes LT and put it on a G-Raid mini - 7200rpm drive. I'm coming in FW800 and still getting warnings playing back my timeline.
The footage says it's 11 MB/s...and my AJA speed test says the drive is reading and writing at over 70 MB/s.
I'm certain there's more to the equation...but what am I missing. I'm using FCP 7.0.2..only doing cuts with one stream of video. 4-tracks of audio.
Suggestions?

yeah...no render bar. Just still choking the system. I have 8GB of RAM (I know only about 2.5 are devoted to FCP) so this shouldn't be. And yep, Studio X...ALL of the footage in my project is now ProRes 422 (LT). I'd send you a pic, but you can trust me.
the other unusual thing is that when I opened the project this a.m. it spent 25 minutes writing audio and video as though some sort of export were set up.
I'm using an external monitor, but that has been the case for years...or at least months with my new MacBook Pro 17-inch.
Something else is choking it, but can't find it.
I added a timelapse today, but it was choking BEFORE that.
Would love to start over, but too much footage to bring back in.
Sequence settings are:
1280 x 720 HDTV 720p (16:9)
Aspect Ratio: Square
Editing Timebase: 59.94
QT Video Settings:
Compressor Apple ProRes 422 (LT)
Quality 100 %
Audio:
Rate 48kHz
Depth 24-bit (half of the sequences are 16-bit)
Config Channel Grouped
Anything look strange there?

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JoeyR wrote:
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jnsail wrote:
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ProRes LT and FireWire 800 GRaid Mini

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