A hard disk monitoring method and a hard disk monitoring system are provided. The hard disk monitoring method includes: determining whether a speaker outputs a sound source by using a host system; if the speaker outputs the sound source, determining whether a performance of the hard disk is lower than a threshold by using the host system; if the performance of the hard disk is lower than the threshold, adjusting the sound source signal of the sound source by using the host system. Therefore, the hard disk monitoring method and the hard disk monitoring system inspect the performance of the hard disk when the speaker outputs the sound source. If the performance of the hard disk drops, the volume outputted by the speaker is dynamically turned down to stop the performance drop of the hard disk caused by the vibration generated by the speaker outputting the sound source.