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As you may know, the performance of a block storage device is commonly measured and quoted in a unit called IOPS, short for Input/Output Operations Per Second.

To put the numbers in this post into perspective, a disk drive spinning at 7,200 RPM can perform at 75 to 100 IOPS whereas a drive spinning at 15,000 RPM will deliver 175 to 210. The exact number will depend on a number of factors including the access pattern (random or sequential) and the amount of data transferred per read or write operation.