USB Attached SCSI

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USB Attached SCSI (UAS) or USB Attached SCSI Protocol (UASP) is a computer protocol used to move data to and from USB storage devices such as hard drives (HDDs), solid-state drives (SSDs), and thumb drives. UAS depends on the USB protocol, and uses the standard SCSI command set. Use of UAS generally provides faster transfers compared to the older USB Mass Storage Bulk-Only Transport (BOT) drivers. UAS was introduced as part of the USB 3.0 standard, but can also be used with devices complying with the slower USB 2.0 standard, assuming use of compatible hardware, firmware and drivers. UAS was developed to address the shortcomings of the original USB Mass Storage Bulk-Only Transport protocol, i.e., an inability to perform command queueing or out-of-order command completions. To support these features, the Bulk Streaming Protocol was added to the USB3 specification, and Streams support was added to the USB host controller interface (Extensible Host Controller Interface).