Dropped frames caused from slow disks (Disk Speed)

I just bought a hard drive enclosure that holds double hard drives. http://www.ewiz.com/photogallary.php?name=CA-400MXS2&show=g Inside the enclosure I put two 400G Seagate SATA drives and made them both scratch drives for my FCE 4 projects. Now when I'm inside Final Cut and doing motion tricks for my footage a warning keeps popping up saying "RT EXTREME HAS DETERMINED THESE DROPPED FRAMES WERE CAUSED BY SLOW DISK. PLEASE TRY:
-INCREASE THE SPEED OF YOUR DISK
-DECREASE THE NUMBER OF RT LAYERS
-LIMITING YOUR RT BANDWIDTH IN USER PREFERENCES
I don't know how to do any of those things above. Now I checked the user preferences and I couldn't find the "RT bandwidth" option to change. How do you change the disk speed or decrease the RT layers??
Sorry if this is common knowledge. I'm still new with this software.

kdjc95 wrote:
recommendations on firewire enclosures??<<</div>
Sounds like what I just went through,
wound up at OWC (as usual) 2 drive 800 FW case was $119
Mercury Elite Pro
just remember that if you raid, the drives should be as close to identical as possible.
i believe this is correct:
usb 2 = 480 mbps
fw 400 = 400 mbps
fw 800 = 800 mbps
that just means usb 2 & fw 4 are about the same, but fw 8 is faster / better for video.
Yeah I was looking at that one right after I posted. That's my #1 pick so far. You have an imac?

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