Super slow SSD internal transfer speeds

Awittyusername

Prominent
May 19, 2017
3
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520
Can anyone give me a clue as to why my HDD to SSD transfer speeds between my internal drives is so painfully slow? It fluctuates between 2.5MB/s peaking around 30MB/s but hovers in the bottom 3rd of those speeds all the time. For reference I have 2 500GB 5400rpm HDDs RAID0 to 1TB and a 128GB SSD.
 
Solution
How much free space is on the SSD? If your SSD is too full they can be slow. Some SSDs had a firmware issue where they got slow if they were more than half full. It could be the way the RAID was created.