Upgrading the hard drive on a Macbook is expensive. Luckily most Macbooks have a SD card reader and one company has taken advantage of that. Introducing the flash storage from TarDisk that slides in the SD card slot, thus expanding the memory of your Macbook. It is a flash memory just like SD cards, so it will be read as an additional storage. Once it slides in, it is flush with the body leaving no traces of external bump. It is available in 64GB, 128 GB, and 256GB. It is expensive but not as expensive compare to the upgrade cost at Apple. Available now!
This is not new but it is the only I have seen that flush with the Macbook body. Many have used an external hard drive to solve their storage solution but this solution is the best as of yet.