Disruptor Shields do not create a barrier, but rather an aura that gets the most dense inside the protected item or person, making them much harder to affect with resonating energy patterns.
Warp, EMP and Mind are rendered thus almost completely harmless, causing just 25% damage.
Daze, Chem and Bio still work, but at a reduced effectivity, causing 50% damage to the shield.
Direct forms of attack like Piercing, Fire, Concussive, Cutting and Plasma inflict full damage.
Only Laser, Electricity and Stabs are so focused that they cannot be impeded by these shields at all.