How can I tell which disk is causing my harvester to crash

[Furious-George]

One of my two harvesters crashes constantly.

I posted a bug about it here, and the suggestion was that a failing disk must be causing the issue.

Since then, I see no clear signs of a failing disk, and yet the harvester still crashes every 2 or 3 days.

How can decipher which disk, if any, is causing my harvester to crash?