To date we've only seen a couple of 480GB mSATA SSDs (Mushkin Atlas and Crucial M500), while most models have been limited to 256GB. The limiting factor has been the physical dimensions of mSATA, which only allow up to four NAND packages. Given that the highest density NAND available to OEMs is currently 64Gb (8GB) per die and up to eight of those dies can be packed into a single package, the maximum capacity with four packages comes in at 256GB (4x8x8GB). Micron is supposed to start shipping their 128Gbit NAND (the one used in the M500) to OEMs during the next few months, which will double the capacity to 512GB, though still only half of what the EVO mSATA offers.