I have the same problem, but i connect any 3,5 IDE HDD and READ is very small - about 1MB/s
And I connected 3,5 IDE and 2,5 IDE at the same time and then NO PROBLEM.
I wander what is the problem too :-/
I think KAMA Connect 2 has problem with IDE 3,5 at UDMA 66/100/133 because i connect 3,5 IDE 3GB (very old) and NO PROBLEM.
With 3,5 SATA, 2,5 ATA = NO PROBLEM
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