This issue has been resolved and USB flash drive access has been restored as of August 31, 2017.
We apologize to users for any inconveniences this may have caused you.
Temporary solution for the Windows environment (added on August 23)
Problems have been reported when trying to read/writing to USB flash drives in the Windows environment.
We kindly ask all ECCS users to use USB flash drives in the Mac environment until the problem is fixed.
We apologize for any inconveniences that this may have caused.