 IOPS vary between 3,000 and 4,000 from around 50 minutes onwards for the rest of the 8+ hour test run.Designers of enterprise-grade flash drives try to extend longevity by increasing over-provisioning and by employing wear leveling.SSD shipments were 11 million units in 2009, 17.3 million units in 2011 for a total of US$5 billion, 39 million units in 2012, and were expected to rise to 83 million units in 2013
to 201.4 million units in 2016 and to 227 million units in 2017.