Samsung introduces Portable SSD T3
 

In recent years a new category of portable storage devices has emerged. Based on the same controllers and flash used in 2.5" SATA SSDs, portable SSDs offer much higher performance and capacities than typical of USB thumb drives. The use of SATA to USB3 bridge chips allows portable SSDs to be used with almost any devices, as opposed to relying on the rare eSATA standard. Most portable SSDs also support the USB Attached SCSI Protocol (UASP) to cut down on the overhead relative to a direct SATA connection. Portable SSDs usually can't match the performance of their SATA counterparts, but they are closer to the native performance than to normal thumb drive speeds.
http://www.anandtech.com/show/9891/s...ortable-ssd-t3