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TR DriveBench 2.0 — Disk-intensive multitasking
DriveBench 2.0 is a trace-based test comprised of nearly two weeks of typical desktop activity peppered with intense multitasking loads. More details on are available on this page of our last major SSD round-up.

We measure DriveBench performance by analyzing service times—the amount of time it takes drives to complete I/O requests. Those results are split into reads and writes.

Impressively, the 850 EVO 1TB nearly matches the mean service times of the 850 Pro. The 250GB drive isn't as quick, but it still represents a substantial step up from the equivalent 840 EVO. The differences between the two generations are particularly acute with writes.

All the SSDs execute the vast majority of DriveBench requests in one millisecond or less—too little time for end users to perceive. We can also sort out the number of service times longer than 100 milliseconds, which is far more interesting data. These extremely long service times make up only a fraction of the overall total, but they're much more likely to be noticeable.

The 850 EVOs slog through fewer extremely long reads than their planar peers. They barely log enough longer writes to show up on the radar, which is especially impressive for the 250GB version. The 840 EVO 250GB suffers more than a thousand writes over 100 milliseconds—150 times more than its replacement.