Then what is UFS?
UFS is the future of Flash memory. UFS 2.0, the most advanced JEDEC standard, offers sequential read/write speeds fast enough to rival SSDs while combining it with the low power consumption of eMMC.
With Samsung’s highly intelligent controller and firmware that provide the highest level of performance and quality, consumers will now have access to a better overall user experience. Along with faster booting, the next generation of flash storage offers a faster data input/output response, three times faster file copy, and three times the multitasking capability. To the average consumer, this means watching high-quality videos, playing high bandwidth games and other entertainment, along with running multiple applications, and downloading or uploading files, all without interruption in functionality.
eMMC vs UFS
UFS boasts a substantial improvement in performance. There are two main factors that contribute to this.
First, UFS has a LVDS(Low-Voltage Differential Signaling) serial interface which has separately dedicated read/write paths. This allows full duplex(two-way interaction) – in other words UFS can read and write simultaneously. eMMC, on the other hand, has a parallel interface which can only send data in one direction at a time – it can either read or write, not at the same time.
Second, UFS has a Command Queue(CQ), which sorts out the commands that needs to be carried out. Thus, multiple commands can be addressed at the same time and the order of tasks can be changed accordingly. eMMC, without CQ***, needs to wait for a process to be completed before moving on to the next one.
The combination of these two, along with Samsung’s engineering feats allows Samsung’s UFS 2.0 solution have a sequential read speed, sequential write speed, random read speed and random write speed each 1.40, 1.66, 2.71, 1.07 times faster, respectively, than eMMC 5.0.