The A-DATA RB19 is not the fastest drive of the bunch. The write speeds are actually quite low, but performance is definitely not the reason why you want this flash device. The rugged design and real water proof casing make the RB19 the perfect choice for all the outdoor athletes. No matter if you are a surfer and have to worry about water or downhill mountain biker having to worry about hard falls or dropping the memory device. In such situations a fast but normal memory device will not hold. If you are looking for a nearly indestructable USB flash disk, the RB19 is a great choice.