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Cloning Speed keeps getting slower

Hello everyone,
I've got the paid AOMEI Backupper pro software and I am currently trying to clone 400 GB from my old 1 TB Hard Drive to my brand new 2 TB SSD.
The HDD is not where my windows 10 system is located. It is only data.

I fear the HDD starts failing thus I run chckdsk /r and started cloning.

It started at over 150 MB/s and 2 or 3 hours remaining time. While I expected it to drop it is now after 24 hours at 2,6 MB/s and 18 hours remaining time. What's worse is that it keeps getting slower. For every hour that passes the remaining time increases or stays the same. Can anyone tell me if this is normal? Will it get faster later on? I am not sure if it will even finish.

I use a USB 3.0 port and a USB 3.0 to SATA cable. I've checked that both the port and the cable as well as my new SSD are faultless.

Thank you for any advice or reassurance.


  • @Murakumo, did you mean that you use the USB 3.0 port and a USB 3.0 to SATA cable to connect the SSD?
    Could you try to copy a big file from the HDD to SSD, then check the change of the speed.

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