@nobody reason:
if you have 1 drive -
you make plot (1/2 free disk's space)
optimize it (need same space)
go to 1)
so you will have plots
1/2 disk's space, optimized.
1/4 disk's space, optimized.
1/8 disk's space, optimized.
1/16 disk's space, optimized.
1/32 disk's space, not optimized.