A "filesystem" designed for chia plots (PlotFS)

[Harris]

To avoid reformatting and moving plots around you can use the classic old LVM method instead:

Tip for using that last bit of space on your drives

Yes, here is an example guide. If the drive contains existing plots and was deployed without LVM, you can use blocks to convert to LVM first, then shrink the existing volume to make space for the second volume which you then add to a volume group that spans across drives.

or

LVM on loopback devices