4K random reads is the standard way to refer to hard drive reads that are approximately 4KB in size, the overwhelmingly common disk transaction size for Windows. IOPS is I/O operations per second. In other words, the Agility 2 can perform 10,000 4KB reads per second randomly located around the disk.
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Is this correct? 4K to 10K. This looks to be adding not trimming back.
So the 10,000 was the result of trimming back from 50,000.