There is no LED indicator for hard drive activity, if that is what you mean. The light at the front of the Macbook Pro is a "sleep" light. When you put your Macbook Pro to sleep, this light will pulse slowly (rather like it is breathing softly; that is the intent). When you start the Macbook Pro up, it will come on solid for a few seconds, indicating a successful POST operation (along with the startup chime).
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HDD Led
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