{L_BUTTON_AT}sergey1878
Email support, you're in need of more assistance than a forum post.
Unless there's a jumper installed on your drives, these should be full speed & not SATA1 speed.
Of course, I took out and inserted the disk repeatedly. I inserted different disks into slot 2. I even installed TOS 4. The result is the same: the device does not work as it should, because it is defective. I contacted the customer service email and opened a dispute on Aliexpress. Let's see how your vaunted service works