![]() These numbers seem to offer more than what Phison promises in the U17 and U18, though real-world testing is essential to compare the two controllers beyond the claimed marketing numbers. The SM2320 USB 3.2 Gen 2x2 controller actually promises 2GBps+ speeds, while the SM2321 USB 3.2 Gen 2 enables 1GBps+ flash drives. ![]() However, they managed to get their design wins shipping along with the public announcement of their SM2320 and SM2321 controllers. Silicon Motion, on the other hand, was late to UFD party in terms of putting out their press release. The Crucial X6 Portable SSD lineup was upgraded earlier this year to utilize the Phison U17 controller, but the U18 controller doesn't seem to have hit retail yet. Sub-400MBps+ class: USB 3.2 Gen 1 flash drives with direct flash-to-USB controllersĪt the 2021 CES, Phison introduced the U17 (USB 3.2 Gen 2) and U18 (USB 3.2 Gen 2x2) UFD controllers, which added additional categories in the above list - a sub-1GBps performance class using direct flash-to-USB 3.2 Gen 2 controllers and a sub-2GBps performance class using direct flash-to-USB 3.2 Gen 2x2 controllers.400MBps+ class: USB 3.2 Gen 1 SSDs with SATA drives.500MBps+ class: USB 3.2 Gen 2 SSDs with SATA drives. ![]() 1GBps+ class: USB 3.2 Gen 2 SSDs with PCIe 3.0 (x4 or x2) NVMe drives.2GBps+ class: USB 3.2 Gen 2x2 SSDs with PCIe 3.0 x4 NVMe drives.2.5GBps+ class: Thunderbolt SSDs with PCIe 3.0 x4 NVMe drives.Traditionally, these portable drives have fallen into one of the six categories below, depending on the performance profile and the components used. Thanks to rapid advancements in flash technology (including the advent of 3D NAND and NVMe) as well as faster host interfaces (such as Thunderbolt 3 and USB 3.2 Gen 2x2), we now have palm-sized flash-based storage devices capable of delivering 2GBps+ speeds. IntroductionĮxternal bus-powered storage devices have grown both in storage capacity as well as speeds over the last decade. Except for the analysis of the thermal design aspects / temperature profile, it also tracks what consumers can expect from the Kingston XS2000 portable SSD. The review below presents a detailed evaluation report of the SM2320 reference design. The firmware used in the Kingston XS2000 and the reference design are pretty much identical, with the only difference being the absence of the casing and thermal solution. Looking to show off their new controllers, Silicon Motion sent across a bare reference board on which the Kingston XS2000 is based. Based on Silicon Motion's SM232x family of USB Flash Drive (UFD) controllers, the product family offers full Gen 2x2 performance at a fraction of the power consumed by the Gen 2x2 SSD solutions currently in retail. The power efficiency aspect changed earlier this month with the introduction of the Kingston XS2000 portable SSD. While such configurations deliver on the 20Gbps promise, they are not particularly power-efficient. Many device solutions have turned up in the retail market over the last couple of years – all of them have been based on ASMedia's ASM2364 bridge chip, with a discrete PCIe 3.0 x4 NMVe SSD downstream of the bridge. The USB 3.2 Gen 2x2 (20Gbps) ecosystem has been slowly gaining traction. Thunderbolt SSDs are at the top in terms of both performance and price, but the last few years have seen various high-end portable SSDs with a USB interface. ![]() The growth has mainly been in in bus-powered flash-based storage devices. The demand has been fueled by increased amounts of user-generated multimedia content and high-resolution artwork / assets for games that are better off being installed in external drives. The external storage market has experienced rapid growth over the last few years, particularly in the retail consumer segment.
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