Dropping frames on playback, any suggestions?

Hi all.
I am having some trouble here... Basically I am getting dropped frames when I playback my fully-rendered timeline.
In my case I have a 90min timeline, 1920x1080, 23.98p, Uncompressed 10bit 4:2:2, 2 tracks of audio (16bit 48khz AIFF's). I am just trying to play back to my standalone dvd burner (Since I can't get quicktime references to export). It's dropping frames at various points in the timeline. Very frustrating since I think it should not be happening. I also have a fully rendered timeline (only some dark blue lines in the render bar area).
Can anyone shed any light on this one? I did a clean wipe of my system about 2 months ago and did a fresh install of Final Cut Studio 2 (I'm on 6.0.6). I have a G5 - Dual 2.5 CPU's, 6.5GB of ram. My drive system is a RAID 5 with a 4 drive stripe, connected via SAS to a Highpoint RAID card.
When I run the AJA disk speed tool, I get around 305 MB/sec. when I look at the graph, the read speed is very consistent. I have run the test multiple times. I have about 20-25% space free on the RAID. I did try to trash the prefs and repair disk permissions on my C: (boot) drive.
Can anyone help please?? Thanks so much.
-Peter

Hi Patrick,
Thanks for the email. I do have all the selections checked under my render options. When I zoom in, I can see that the blue render bars are above the areas that are already rendered. When I hover my mouse over the bar it says 'Video: Rendered'. So I'm pretty sure everything is already rendered.
When I used the AJA Data rate calculator, it said that 1920x1080, 23.98, 10bit video has a data rate of 132.58MB/sec. So I am confused. It seems like my disks should be fast enough to handle the 1 stream of HD video.
What else can I be missing? It's so frustrating that it won't work!
thanks,
Peter

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Power book G4 (15 Titanium) Mac OS X (10.4.6)

Dropped frames during playback and Record To Tape

Mac G-5, OS X 10.4.4; 4 X 2.5 GHz; 4.5 GB DDR2; NVIDIA GeForce 6600 w/256MB.
G-Raid 1TB, Format Mac OS Extended; External FireWire 800 port.
Maxtor 300GB Internal, Format Mac OS Extended (journaled)
Tape deck, Sony Mini DV GV-D1000 NTSC FireWire 400 port used for digitizing and mastering.
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Here are some screen caps of the item info windows:
http://img263.imageshack.us/img263/1696/screenshot20100608at115.png
http://img43.imageshack.us/img43/1696/screenshot20100608at115.png
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