@Techgtv if youre using the wallet then you dont have to think of the nonce, wallet have the ui to adjust how much size you want to plot. so your only problem is the starting nonce? plot the first file(eg. 8732494484217888794_500000001_40960_40960 [10GB]plot), the file is save (eg F:\Burst\Plot). right after plotting the first one, plot the 2nd file without moving the first file so the wallet will calculate the starting nonce, after you started the 2nd plot then now you can move the first plot from (eg F:\Burst\Plot) to (eg. f:). then you can now mine with it.
if you want compute the starting nonce manually from the first file, just add the 2nd number (500000001) to the 3rd number (40960)