I just got a 1TB X5 SSD and am only getting 350MB/S when writting a 10GB 4K video file to the drive. I'm writing the file from an Evo 970 1TB NvME internal SSD so I would expect to get close to the full advertised performance. Read speeds are fine, but write speeds tap out at 350MB/s which is not fast enough to justify the premium on this drive. I've tried the drive on two different systems and with two different thunderbolt cables and same problem. Is this a known issue with these drives? Is the drive defective?
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