Is it possibal to capture uncompressed video data at
8 bit @ 1920 x 1080 @ 25fps = 99 MB per/sec, or 348 GB per/hr.

using one of these hardrives
OCZ Vertex 2E 120GB 2.5

OCZ Vertex 2E 120GB 2.5" SATA-II Solid State Hard Drive (OCZSSD2-2VTXE120G) [OCZSSD2-2VTXE120G] Internal Hard Drives Solid State Drives 120GB - 480GB (http://www.overclockers.co.uk/showproduct.php?prodid=HD-048-OC&tool=3)

info on data rates
Blackmagic Design: Support Detail (http://www.blackmagic-design.com/support/detail.asp?techID=30)

it says the sustained write speed is up to 250MB/sec

I know every one moans that i should use raid but i want to know if it is theoretically possibal to do it on a single drive plus i will have trim support which i dont get with raid ssd`s

Maximum Read: 285MB/sec
- Maximum Write: 275MB/sec
- Sustained Write: 250MB/sec

It should easily do this according to the specs. But will your footage stay below 120GB? One minute is around 6GB. At the most you can hold 20 minutes of footage.

Well 20 mins is a good start.
If you want more I guess you could have the 1TB ssd drive from OCZ
1TB OCZ Colussus LT announced - Pocket-lint (http://www.pocket-lint.com/news/32581/1tv-ocz-colossus-lt-announced)

I know it isn't what you are asking but capturing to a good intermediate codec like Prores HQ is very, very nearly as good as uncompressed without nearly as much hassle.

Would be worth testing the difference before spending money on an uncompressed workflow.

I totally agree, the reason I am posting this question is that I build portable capture solutions for my customers and in some cases a customer may ask if my unit can capture uncompressed data?

Also another good reason to capture to uncompressed is so you could decide latter if you want to convert your footage to an intermediate codec like Cineform or Pro res.