When using removable data carriers such as USB sticks or external hard drives, you can also specify that only specific removable data carriers are allowed to access your computer. To do so, attach the removable data carrier to your computer and click on the Add button. In the dialog that appears, you can select the removable data carrier you want. If you now click on OK, another dialog opens in which you can specify which access method you want for this data carrier and whether authorization for this data carrier is limited to a specific period (e.g. two weeks) (Validity) and whether every user is allowed to use this data carrier under his user access or not.