I just tried that trick, and it works in Snowy, but I wonder how much faster, if at all, the simultaneous multiple processes will run than consecutive individual ones?

Since you'll no longer need the Pro, this is an ideal opportunity for you to enlarge the body of knowledge... If you zero one drive individually, and then zero the other three simultaneously, it seems like you ought to get a pretty good idea of the relative speeds of the processes. (I don't think the amount of data written to a disk will make a difference.)

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire