- Chrome OS
Users in your organization can use ChromeOS devices to mount external drives, including USB flash drives, external hard drives, optical storage, Secure Digital (SD) cards, and other memory cards. If you disallow external storage and a user attempts to mount an external drive, Chrome notifies the user that the policy is in effect.
If you choose to Allow external storage devices (read-only), users can read files from external devices but cannot write to them. Formatting of devices is also disallowed.
This policy does not affect Google Drive or internal storage, such as files saved in the Download folder.