The IOMeter indices are a normalized average of Light, Medium, and Heavy loads
Quantum's Atlas 10k II rules the roost when it comes to the IOMeter File Server Index. Its score of 242 bests all drives save only the Cheetah X15. The Cheetah 36XL's score of 240, however, places it less than 1% behind the Atlas.
A Workstation Index comparison favors the Cheetah 36XL. Its score of 253 leads the Quantum by a significant 12%. Database Index scores are very close... the Cheetah leads by a mere 1%.