Problem:
After a recent Windows update, an external hard drive may fail to connect and show an error in Device Manager under “USB Attached SCSI (UAS) Mass Storage Device.”
The device status displays:
“This device cannot start. (Code 10) – Driver %2 has been blocked from loading.”
As a result, the external drive does not appear in File Explorer or Disk Management, even though the drive itself may be physically healthy. This issue is commonly caused by driver conflicts, Windows security features, or incompatible USB–SATA bridge chipsets.
Resolution:
Disable Memory Integrity
Open Settings → Privacy & Security
Go to Windows Security
Select Device Security
Click Core isolation details
Turn OFF Memory Integrity
Restart your PC
Force Windows to Use USB Mass Storage Driver
Open Device Manager
Expand Storage controllers
Right-click USB Attached SCSI (UAS) Mass Storage Device
Select Uninstall device
Check Delete the driver software for this device
Restart the system
Reconnect the drive using a USB 2.0 port or cable.
Change USB Port or Cable
Avoid front panel USB ports
Use motherboard USB ports
Try a different USB cable
Update Chipset & USB Drivers
Download and install the latest:
Chipset drivers
USB controller drivers
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