Stream 2 x 120 fps cameras to disk ... HDD can't keep up?

So I have two Basler firewire cameras. Each camera has its own firewire-B card. And I I wrote some LabVIEW software that can grab frames at 120 fps per camera.
But I am unable to stream to disk quickly enough to keep up with the frame grab. Even if I use a producer-consumer architecture, my buffers end up overflowing. Because I am logging from two cameras simultaneously, I am essentially streaming 240 fps to disk, and each image is color and 640x480.
Question: any reccomendations on how to get around this? I am curious if a new and fast PC with a super-fast HDD will solve the problem. Or maybe even a SSD drive?

It all depends on the data rate you have to stream. Different storages have different performance. Benchmarks are the key to get a feeling if a storage type (HDD, SSD, RAID) is sufficient to handle the given data rate. This white paper has some sample benchmarks included which can give you some figures.
Let's make a small calculation on your figures:
640 * 480 (Resolution) * 2 (32 bit color depth) * 240 (fps) = 147456000 B/s. This is round about 147 MB/s. Pure data without any additional information.
So you can see that even SSD will most probable be not sufficient (read something about 70-80MB/s for SSD writing), so you will have to use RAID.
hope this helps,
Norbert
EDIT: The transferrates for SSD is very different. Maybe, this chart helps a bit, even though it does not state MB/s....
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