It will depend on who made the disc (copy) and what mods were done to it.

If the disc has been POIson modded (and has the red light cameras loaded), then you should get a beep when you get close to it.

Read the POISon thread it give a good account of the Mod and it's caveats.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.