SSD to SSD USB 3.0 slow transfer

hopthedog

Estimable
Dec 28, 2015
2
0
4,510
Transfering large files from intenal to external gets 50MB/s, transfering from external to internal gets 150MB/s. Using a different HDD I get 100MB both ways, so the cable is not the limiting factor.
 

hopthedog

Estimable
Dec 28, 2015
2
0
4,510


What? this is a USB 3.0 connection. My issue is that when writing from an internal SSD to an external SSD connected by a USB 3.0 wire the speed is limited to ~50MB/s but when I write files from the external SSD to the internal SSD I get ~150MB/s. How can the connection one way be 3x faster than the other when both drives are SSDs and not close to their max read / write speeds? I only included the HDD speeds to show that the cable itself can at least sustain 100MB/s both ways in case it was some funky issue.