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.
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