@robert the problem in the command is the amount of nonces that you want to plot. for 100GB the command should be like this:
./plot -k 689191891761033001 -d /Volumes/ArchiveRB/plots -s 0 -n 381469
You have to convert the space that you want to use for burstmining to nonces
use this link to do it
http://noncescalc.esy.es/
after that, sit and wait. I did that same command on my mac and it took almos 4 hrs to plot that amount.