Is there any way to show Disk Space (Used/Free) in Winstep Xtreme?

Not yet... that is one of the modules in the to-do list waiting for me to implement multi-session modules.

Were you thinking more in terms of a free form desktop module, or as module icons in docks, each icon representing a drive?

Not to take anything from the OP, but myself I'd say both desktop (for Xtreme) and icons. Also, one that gives an aggregate of all disks' activity, i.e., B/KB/MB/GB read and written and current read/write. And then one module indicating total capacity, amount/percentage used/free for each drive, in sort of stacked form (as this will not have much activity it would be pointless to have separate mods for each drive.

A question arises - hypothetical here as I no longer use it - i.e., with WSL/WSL2 Windows can read Linux partitions. Would any mods be able to do so?

I have also been looking into this. My idea is actually a single desktop module for all the drives. One that is made from the ground up to be able to accommodate/show all the drives in the system by default (and then only those the user selects).

Skinners would simply need to make a module background that can dynamically grow vertically (or horizontally?!) to accommodate multiple rows, each row having information about a single hard drive. Info would be used space, free space, possibly a bar graph (or perhaps pie chart) displaying used vs free space, an histogram graph displaying activity over time (bytes read/written per sec) and I would also like to display drive temps (and while at it a SMART alert if required, since to read drive temps I need to access SMART data).

Question is coming up with two suitable default module styles (much like the styles for the calendar module). Perhaps the base for these two styles would be precisely vertical + horizontal orientations.

The only "problem" would be the iconic drive modules. Each iconic module would only be able to show limited information about a single drive (not that hard to do since the Eject CD ROM internal command already accepts drives as an argument - in this specific case optical drives only, of course) so it would work pretty much the same way.



No idea. If the Linux drives/partitions appear in "My Computer", perhaps.

Single mod for all (or user selected) drives with bar graphs for used/free space would be fine. To have activity etc. in the same mod would, IMO, make things rather messy and bulky. I think a separate mod with histogram for all drives (aggregate), much like the present CPU mod, would be better. Also especially makes icon mods much easier, I'm sure.