Even if this was expected behavior for the drive. I asked support if I should expect to see TRIM working (it wasn't clear if it was), if there were any firmware updates I could perform, if there was a special way to format it, or anything I was doing incorrectly that would cause these slow speeds. At times, I was even seeing poor speeds from the drive with it completely empty. I found that completely formatting the drive would improve both up to 340 MB/s and 310 MB/s respectively but filling up the drive even 20% would cause speeds to quickly drop way back down. I initially saw my drive easily hit the advertised speeds of 400+ MB/s reads and 300+ MB/s writes pretty continually.Īfter 10 months of light use, I opened a ticket with SanDisk support in September 2018 reporting diminished read speeds of 273 MB/s and heavily diminished write speeds at 53MB/s. I've been seeing poor performance on my SanDisk Extreme Pro 256GB USB drive since its initial purchase in November 2017.
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