@Trevelyan The only way to find out is to play around with it.
I’d suggest first creating a single partition disk resizeable image - and then just specify in the host’s general properties which Host Primary Disk to use. To find out what that is for the 2nd drive, boot into a debug upload task, and just find the name that fog uses to refer to the 2nd disk. It’ll be in the devices virtual file system ( /dev ), it’ll likely be /dev/sdb but you must look to be sure. Specify the correct Host Primary Disk in the host’s properties page and then do an image capture as usual.
Then try to deploy that image to a test machine (not your golden machine) and just see what happens. Make sure you specify the Host Primary Disk parameter for the test machine.
If that works as you want, try it on a different model test machine, with maybe a different sized hdd in it. See what happens.
Please let us know how it goes and what you learn.