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So I formatted my 1TB-SSD (half half in NTFS and exFAT partitions) and put it into a USB-3.1 external case. Both Partitions have fast speeds in CrystalDiskmark Test. (523 M/s read, 428 m/s write) However, when i start copying files, lets say, to my internal SSD in my laptop, my current speed is around 250 kb/s (!!) Yes, you read right. Thats a slow speed, even compared to an internet transfer.

Any idea whats going on here? As said, by themselves, the from-and-to copying disks are fast!

How can I go about this?

My laptop is an High End i7, btw.

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    How many files? How big? – Kamil Maciorowski Sep 14 '17 at 15:04
  • all mixed, some very tiny files, some quite large (1 Gig or more) – TobiasH Sep 14 '17 at 15:07
  • Most SSD benchmarks test really small files. I am not sure the relevance your processor has on USB transfer speeds. – Ramhound Sep 14 '17 at 15:07
  • This is probably explained by differences between large sequential reads/writes and small random reads/writes. Large/sequential speed is great for coping large files, and small/random speed is great for lots of small files and using it as a live (especially boot) filesystem. You really need to see the speeds for both kinds of tests in order to know how your device will do in different situations. – Spiff Sep 14 '17 at 19:01

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