When used with an SSD, UAS considerably increases the random read and write speeds compared to BOT. To see if UAS is being used by Windows, do the following.
- Press Win + X keys together on the keyboard and click Device Manager.
- Expand the “Storage Controllers” node and see if it has a “USB Attached SCSI (UAS) Mass Storage Device” listed. If not, then expand “Universal Serial Bus controllers” tree node in Device Manager.
- Double click on the “USB Mass Storage Device” for which you wish to check this.
- Go to the Driver tab and click the Driver Details button. If it says USBSTOR.sys, then it means Windows is using the older Bulk-Only Transport Protocol with your USB device. If it says UASPStor.sys, then it means UAS Protocol is in use.
Source: Check if your USB 3.0 device supports USB Attached SCSI (UAS) Protocol
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