If you're looking to buy HDD and you need to know what IOps it can sustain, here is a formula you could use:
IOps = 1000[msec] / (Average seek time [msec] + Average Latency [msec])
For example let's calculate IOps for this IBM SAS HDD
1000 / 4.7 + 3 = 129.87 IOps
Links:
http://blogs.smugmug.com/don/2007/10/08/hdd-iops-limiting-factor-seek-or-rpm/
http://technet.microsoft.com/en-us/library/bb897498.aspx
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