The appropriate way to label an approved portable hard drive is to label it on the outside only, being careful not to draw attention to its contents. Any labeling should avoid covering ventilation holes and should not be placed on areas that might interfere with connectors or important ports. Using flat surfaces for ink or tape is generally safe. Labels usually include purchase date, serial number, capacity, and a brief description of contents or purpose. Using a label maker or neatly written labels with durable tape is preferred. Avoid labeling that might attract unwanted attention to the drive's data while making identification clear for authorized users.