i think the issue here has to do just with overwriting existing data there's four things you might want to do to your storage whether disk tape or ssd a initialize it b read from some area c write data to a previously unused area and d write data to a previously used area bubble memory can't treat c and d equivalently with bubble memory you can't change a one into a zero like you can change a zero to a one the former requires special processing the latter does not and that special processing is several times more time consuming than b or c it's such an exceptionally slow process with high overhead that your perception of your ssd would probably be unfavorable if the manufacturer allowed you to perform it on small chunks of data an analogy if you're going to drive a long way to the store get everything in one trip even if you don't need it immediately because if you have to make two or three or four trips you won't be pleased with the result