![]() That effort was resurrected as UAS-3 which is now a published standard (INCITS 572-2021). A UAS-2 project was started by T10 but cancelled. The UAS standard (ANSI INCITS 471-2010 and ISO/IEC 14776-251:2014) has been superseded so it should be referred to as UAS-1. Many NVMe to USB adapters are USB Attached SCSI devices. When used with an SSD, UAS is considerably faster than BOT for random reads and writes, but still well below the speed of a native SATA 3 interface for certain write tasks. Although UAS was added in the USB 3.0 standard, it can also be used at USB 2.0 speeds, assuming compatible hardware. UAS drivers generally provide faster transfers when compared to the older USB Mass Storage Bulk-Only Transport (BOT) protocol drivers. The USB mass-storage device class (MSC) Working Group develops and maintains the UASP specification the USB Implementers Forum, Inc. The T10 technical committee of the International Committee for Information Technology Standards (INCITS) develops and maintains the UAS specification the SCSI Trade Association (SCSITA) promotes the UAS technology. UAS is defined across two standards, the T10 "USB Attached SCSI" (T10/2095-D) referred to as the "UAS" specification, and the USB "Universal Serial Bus Mass Storage Class - USB Attached SCSI Protocol (UASP)" specification.
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