We spend money to reduce time, by distorted benchmark result, I post this report to Testers that report help for reducing time and monety to others to be more accurate result. USB-stick Write-speed is important for move data to other. When writing, by empty cache(part also available), cache can be occupied high speed, This shows fast performance in intial parts. Behavior of cache is different by on/off cache. If Cache has no space to receive data, Speed-Decreasing occured. on writing cache will be have spaced already written this is empty space, this emtpy space will be occupied by new transfered data. cache size is much smaller than this value. 3.52GiB write-speed suddenly reduced, this is not mean cache size. On This testing, By USB-Stick is not clean, 1GiB Test result slower than clean device.Īt pos. In real world, User can be expierenced 1GiB Testing speed, But For someone to transfer Large size file, 16GiB test is reasonable.ġ6GiB option also has a little distortion. so, Test actual speed of flash-memory, Must be use more than cache on testing. This behavior make that small size data will be handled maximum speed. When drive receive data, The controller of device save these data to CACHE, and refetch it, and then actually save on flash memory. In case SATA3 SSD, This speed is even higher than bus-speed. This cache is very faster than Flash-memory. To improve performance, Devices has cache memory(Don't confuse cache of OS). This value eliminate the distortion caused by cache memory. To measure actual or reasonable speed, I suggest 16GiB for testing. but, This testing will spend more times and not good at Flash-memory device such as SSD, so, must be tested with proper size. actual spped, specially for test benchmark, This value must be almost to drive size. by growing the size of these devices, 1GiB option is not report actual speedĭefault value is 1GiB. The CrystalDiskMark is powerful testing tool to measure SSD, USB-Stick, Sd-card and so on.

Crystal disk mark test