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The macOS USB External Storage Restriction policy prevents access to external storage attached via USB, Thunderbolt, or an SD Card slot. External storage USB devices include thumb/jump drives, external hard drives, and SD cards.

Considerations

• Applying this policy restricts your external storage capabilities. You will be unable to mount new attached devices after the policy is applied.
• Removing this policy makes the USB ports available again for mounting storage devices.
• Any devices attached at the time of application of the policy will still be usable until reboot.
• This policy applies to all users on a device. Only managed users will receive notifications that storage is blocked. All other users will be silently blocked.

Creating a USB External Storage Restriction Policy

To create a ºÚÁϺ£½Ç91Èë¿Ú USB External Storage Restriction Policy for Mac:

1. Log in to the ºÚÁϺ£½Ç91Èë¿Ú Admin Portal: .Ìý
2. Go to DEVICE MANAGEMENT > Policy Management. 
3. In the All tab, click (+) to create a new policy. 
4. On the New Policy panel, select the Mac tab. 
5. Select USB External Storage Restriction Policy from the list, then click configure. 
6. (Optional) In the Policy Name field, enter a new name for the policy or keep the default. Policy names must be unique.
7. (Optional) In the Policy Notes field, enter details like when you created the policy, where you tested it, and where you deployed it.
8. (Optional) Select the Device Groups tab. Select one or more device groups where you want to apply this policy. For device groups with multiple OS member types, the policy is applied only to the supported OS.
9. (Optional) Select the Devices tab. Select one or more devices where you want to apply this policy.
10. Click Save. If prompted, click Save again.
11. Reboot your system for this policy to take effect.z