HP V3000, V3000Z, V3001XX, V3002TU, V3002XX, V3003TU, V3004XX, V3006TU, V3008AU, V3009AU, V3010US, V3011XX, V3013AU, V3014AU, V3014TU, V3015NR, V3016US, V3017LA, V3018CL, V3018US, V3019TU, V3019US, V3020TU, V3020US, V3021TU, V3022TU, V3024AU, V3029TU, V3030TU, V3030US, V3031TU, V3032TU, V3036TU, V3038TU, V3042TU, V3043TU, V3047AU, V3048TU, V3049TU, V3051TU, V3053TU, V3055TU, V3071TU, V3072TU, V3100, V3102XX, V3103XX, V3110CA, V3114AU, V3115LA, V3115TU, V3116TU, V3117LA, V3124TU, V3126TU, V3131AU, V3139AU, V3140AU, V3144AU, V3147AU, V3156TU, V3168AU, V3182TU, V3183TU 2 Drive light

The drive light blinks when either the primary hard drive or an optical drive is being accessed.