There are some numbers already provided by vendors
SAS (15K RPM) à 175 IOPS
SATA (7.2K RPM) à 75 IOPS
Now how do they come up with these numbers?
The formula is
Estimated IOPS = 1 / ((Seek time/1000) + (Latency / 1000))
Now let’s put this formula into perspective
Seagate Cheetah 15k hard drive
Estimated IOPS = 1 / ((average read seek time + averagewrite seek time)/2)/1000 + (Average latency / 1000)
Estimated IOPS = 1 / ((3.65 / 1000) + (2.0 / 1000) = 1 /(0.00365) + (0.002) = 176.9911
Answer is ~ 175 IOPS
