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I am making a disk-to-disk clone using CloneZilla where both source SSD and target SSD are connected to the computer using SATA-3.

Both drives are from the same Vendor and have the exact same size and read/write speeds (Samsung, 250 GB, 400+ MB/s).

CloneZilla is showing me that that the transfer rate is 2 GB/minute, which translates to 33 MB/s.

Why is the transfer speed so slow?

I also tried cloning the drives via USB 3.0 which doubled the speed, but still, why is it so slow?

Shouldn't the transfer rate be close to 400 MB/s at least?

  • What is your Motherboard? – NetworkKingPin Jun 16 '16 at 4:36
  • It is a GA-X58-USB3 – vaid Jun 16 '16 at 4:59
  • One last question how are you running clonezilla exactly? this could affect your speeds depending on where you run it. – NetworkKingPin Jun 16 '16 at 5:07
  • To be exact: I am running it in a virtual machine. I have set up the SOURCE SSD to act as a physical drive inside VirtualBox. Like I said in my post: The exact same setup but with USB3.0 Source to SATA Target gives me twice the speed, but still 10th of the speed expected. – vaid Jun 16 '16 at 7:39
  • What kind of virtual machine? What solution are you using? Are they attached to a physical SATA-3 controller? – Seth Jan 26 '17 at 8:21
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Try adding

libata.noacpi=1

to the kernel command line, as suggested on the ubuntuforums thread Cloning SSDs using DD is very slow. In my case, the copy speed from an SSD attached via a USB SATA enclosure increased by a factor of about 20. Your mileage may vary.

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