This is necessary to allow file transfers via Lightning port. There's one reason here that keeps it a certain size - it features a built-in battery. Its iXpand device comes in capacities of 16, 32, 64 and 128GB capacities and SanDisk sent us the 32GB version to test. So, enter storage experts SanDisk with a handy solution - particularly if you want to carry more media around with you. And let's be honest, most of us might think we can get away with the smallest capacity, only to become frustrated when we end up using it a lot more than we thought we would. Storage on iPhone and iPad can become a problem if you buy a smaller device than perhaps you need.
