reade here: https://forums.burst-team.us/topic/188/is-there-any-chance-of-winning-block-with-100gb-or-less-size-plots/3
But seriously, you can mine with 100gb, but if you have your pc or laptop just running for that, you will not make profit at current prices due to electricity bill.
Burst is 'Proof of Capacity' ... so if you seriously want to play this game, you should consider adding more capacity.
Don't get me wrong, you are welcome to mine with us, but you will only earn in relation to your investment.
100gb are currently available for below 3€