AVCHD Video Editing Stutters using Drobo FW800

I'm having problems with Final Cut Express stuttering during editing, playback of the timeline.
I've recently changed from several USB external Hard Drives to a Drobo FW800.
Using three external drives over USB, I had no problem, but now using the Drobo over the Firewire 800 connection, the video stutters and freezes whilst the audio continues.
We currently have System Settings, Scratch discs "Video Capture, Audio Capture, Video Render and Audio Render" all set to the Drobo:Final Cut Express Documents folder. Waveform and Thumbnail Caches and Autosave Vault are set to Internal Hard Drive.
I've tried deleting Preference files, and recreating the project file.
Any comments or suggestions would be appreciated.
System: iMac 24" 2.8GHz Intel Core 2 Duo, 1.5Tb internal; 4GB 800 MHz DDR2 SDRAM, Snow Leopard 10.6.6 -
Drobo FW800 with 3 x 2Tb Seagate, 1 x Hitachi 1Tb

Thanks everyone for your posting, comments all appreciated. Here's an update on where we are....
We ran AJA Tools and discovered that the Drobo FW800 is having trouble maintaining the data transfer rate with our iMac, despite the Firewire 800 connection: See below:
AJA System Test settings used:....
Data transfer rates with the Drobo FW800 are as follows:
Using a single external Hard Drive over USB we get the following:
On the advise of the supplier we have removed the Hitachi drive..... perhaps the Drobo does not like brand name mixing...? We are now allowing the Drobo to restore the backup data before we can continue with further testing.... 24 hours required.. !! Suppose that's the price you pay for maintaining data integrity.
We have also referred the problem to Data Robotics' Technical Support and are hoping for an answer soon.
I would expect a device designed to work with Firewire 800 should give better results than a USB connected drive...? I'll keep you posted on progress.
PS MartinR: Our clips are 1920x1080 Apple Intermediate Codec which were importing from a AVCHD camera to FCE, flawlessly, using Log and Transfer. Editing with the scratch discs on seperate external drives using the USB connection also worked very well.

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What's the most effective way to speed up AVCHD video editing?

Hello Everyone,
I'm having the same problem, my wife and I have a small wedding videography company, I film jobs on weekends when I'm not working full time and my wife stays home with our 2 year old daughter and edits during the week.
When jobs come in we both are using our macbook pro's for the import process because it takes SOOO long to import all the avchd clips. We're filming with the Panasonic HMC40 shooting in 720/30p on Class 10 16GB SDHC Cards.
I have an early 2008 macbook pro, 2.4Ghz Core 2 Duo 2GB of ram, and my wife has a 2010 unibody with a dual core i5 w/ 4GB of ram.
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Our compeditors are offering 'same day edit' services, and making basically a trailer of the events that happen at the ceremony, then editing them on site in a 3-4 hour time window between the ceremony and reception, then using a projector and screen to show that trailer at the beginning of the reception, usually added to the slide show.
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Thanks.
Chris
[URL="http://freedomvideography.com"]Wisconsin Wedding Videography[/URL]

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AVCHD Video Editing Stutters using Drobo FW800

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