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Full DD copy from hdd to hdd

If I have 2 identical hard drives with the following characteristics:

  • SATA 6.0 Gb/s
  • 5400 rpm
  • 3TB

connected to the same sata cable via a single sata port on the motherboard. How long should a full dd copy take to complete?

So far it's been running for 5 hours and still going...

I am using Linux Ubuntu 12.04 64bit and the command I am using is:

dd if=/dev/sdb of=/dev/sdc