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Comparing the '4K Q32T16' and '4K Q1T1' numbers can quickly tell us whether the storage device supports NCQ (native command queuing) / UASP (USB-attached SCSI protocol). ![]() The plain 'Rnd4K' one uses only a single queue and single thread. The 'Seq1M' traces use a 1MiB block size. The 'Seq128K Q32T1' sequential traces use 128K block size with a queue depth of 32 from a single thread, while the '4K Q32T16' one does random 4K accesses with the same queue configuration, but from multiple threads. Internally, CrystalDiskMark uses the Microsoft DiskSpd storage testing tool. Two of the traces are sequential accesses, while two are 4K random accesses. for example, uses four different access traces for reads and writes over a configurable region size. It does allow the visualization of change in transfer rates as the I/O size changes, with optimal performance being reached around 1 MB for a queue depth of 4.ĬrystalDiskMark. ATTO benchmarking is restricted to a single configuration in terms of queue depth, and is only representative of a small sub-set of real-world workloads. ![]() Based on the ATTO benchmarks below, it appears that Silicon Power has been a bit conservative in its write speed claims. Silicon Power claims read and write speeds of 1050 MBps and 850 MBps respectively. Synthetic Benchmarks - ATTO and CrystalDiskMark Yet another use of these synthetic benchmarks is the ability to gather information regarding support for specific storage device features that affect performance. The results translate to the instantaneous performance numbers that consumers can expect for specific workloads, but do not account for changes in behavior when the unit is subject to long-term conditioning and/or thermal throttling. ![]() Benchmarks such as ATTO and CrystalDiskMark help provide a quick look at the performance of the direct-attached storage device.
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