On a Windows system, the error code "0X80071AC3" means that your external flash drive / hard drive had not been properly removed during data transmission, which resulted in the system not recognizing the external device.
To troubleshoot, please restore your flash drive / hard drive by the following steps:
1. Open My Computer
2. Right click on the flash drive
3. Select Properties→Tool→Check Error
Or, if you're using a JetFlash, you can run the "JetFlash Online Recovery" software to solve the problem (Please note that this step will erase all the data stored in your JetFlash. Make sure you back up first.).