intermittent plotting

  • Hello,
    Last week i started plotting my 2TB hard drive.
    But when i started it and i had a few percent ready,somebody pull out the USB because she had no idea what i was doing with it :P.

    When i start up plotting again in the wallet i had to start from 0 percent plotted.
    If something like that happens again is there a way to restore it to the moment when the usd is pulled out or not.

    Also another question.
    If i want to transfer a fully plotted Hard disk to another pc, do i have to plotting it again or is it saved then.