![]() Unmount the volumes on the external SSDs (do not eject them since that will cause the drive to lose power) so you can leave the SSDs physically connected and powered on, but they won't have any data transfers or communication with the Mac. The longer the SSD speed test the more likely you will encounter poor write speeds. If an SSD overheats the SSD's speed will be throttled until the SSD cools off. I have seen some SSDs slow down to 50MB/s and it can take a long time for the write speed to recover. How much the speed will drop depends on how the SSD was designed. To make up for the slower NAND memory speed SSDs implement a write cache to make it appear that the SSD is faster, but once this write cache fills up the SSD's speed will drop. ![]() ![]() In fact most speed tests reported on these forums many times will show the SSD's write speed to be about half of the read speed. ![]() As SSD technology advances (or rather changes) the NAND memory used in SSDs is becoming slower (and also has less endurance, aka number of lifetime writes) so SSD write speeds don't usually end up at the top end of the spectrum.
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