How to Block USB flash Drive and External Hard Disk using SEP.
In the Symantec Endpoint Protection Manager, open Policies, then click Application and Device Control.
Open an existing policy or click Add an Application and Device Control Policy.
Click on the Device Control tab.
Under the Blocked Devices section click the ADD button and select the Disk Drives option.
Click OK to save the changes and assign policy.
Warning: Failure to add device exclusions for critical system devices may lead to system instability or blue screens. Some disk controllers may be addressed using a USB bus and will be blocked, possibly blocking SAN and iSCSI devices. Please test all policies before using in a production environment.
Imported Document ID: TECH188946
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