Transfer protocols[Edit]
BOT transfer protocols : BOT (Bulk-Only Transport)[10], was born in 1999, specifically designed for USB 1.1, so far the fastest USB 3.1 is backward compatible to the basic BOT transfer protocols. At the outset of operations to transfer data, external USB 3.0 devices and computer motherboard (USB 3.0 expansion card), in the same unit of time, transmitting only a single instruction at a time, so the speed is slower than UASP, a "half-duplex transfer mode".
UASP transfer protocol [11] [12]: UASP (USB Attached SCSI Protocol), was born in 2008 with USB 3.0, USB Implementers Forum (USB-IF) to improve the BOT transfer protocol slow shortcomings, SCSI architecture improvement and introduce UASP, including multiple parallel processing capabilities, task management command and control mechanisms, supports NCQ (Primary ordering), the speed is much faster than the BOT transfer mode, a "full duplex transfer mode". Start the UASP can increase transmission efficiency, but it also has a number of restrictions, computer users must have the UASP-enabled external USB 3.0 device within the device controller, the host controller on the motherboard, drivers, three can be excluded (some still need to install extra ren body). In terms of OS support, Windows 7 users who want to start the UASP, you must install the corresponding driver, if a user uses Windows 8/Mac OS x 10.8.3 and later rolled out version 10.9 of because it has built-in UASP drivers so direct native support UASP, this can save the trouble of installing the driver. UASP device-side bridge IC: LucidPort Xiang master ASMedia USB 300, one thousand fifty three-one thousand forty seconds, Chi micro JMS 569, Texas instruments, TUSB9261, and so on.