Apple advises against using sliding webcam covers on MacBooks because they can cause permanent display damage while providing no meaningful security benefits for modern hardware with integrated privacy indicators.

Key Points

• Apple warns that closing a MacBook with a webcam cover thicker than 0.1 mm can crack the display due to tight hinge tolerances.
• Modern Macs feature a hardware-level circuit that forces the green privacy LED to illuminate whenever the camera sensor receives power.
• The hardware-linked indicator design, implemented in all Macs since late 2008, prevents malware from activating the camera without alerting the user.
• Security researcher Patrick Wardle developed the OverSight tool to provide additional alerts whenever the webcam is actively in use.
• Using webcam covers can interfere with ambient light sensors, potentially causing features like True Tone to malfunction.

Why it Matters

These findings highlight that physical privacy accessories often pose a greater risk to hardware integrity than they do to digital security. Users should rely on built-in macOS security features and software monitoring tools rather than potentially damaging physical modifications.