Using Toshiba 15nm MLC NAND. Following generation will use 3D stacked BiCS NAND. Back in May 2014 HEXUS covered the news of Sandisk's launch of its Optimus MAX Serial Attached SCSI (SAS) solid state drive (SSD) with a capacity of 4TB. This is an enterprise focussed drive, sold at a breakthrough price point. At that time a SanDisk marketing executive told ComputerWorld that this 4TB drive was "just the beginning" and we should expect to see a doubling of capacity every year or two. Well it's turned out that it won't be a year, it will be two.