Data Transfer Diagrams
Western Digital WD4000KD (7,200 RPM), Single Drive

Western Digital WD4000KD (7,200 RPM), RAID 0

Western Digital WD1500 (10,000 RPM), Single Drive

Western Digital WD1500 (10,000 RPM), RAID 0

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I would have been really impressed if you guys took 4 drives at 7200rpm and low sizes, like 80gig drives, and did a RAID 0 with 4 drives and compared that speed with them. The access time would have been the same, but for the cost, the read and write would have been retarded high and made it look silly.
Then again, your electricity bill may be the difference in the cost, lol.