Why is disk space taken every 20 seconds?

Recently, I used boot camp to install Windows XP. I used the partition of 32GB for XP. Now, when I look at the macintosh HD info, it shows that the capacity is 153.88 GB and available are 126 GB. The only thing that I stored after partitioning the HD was 6.96 GB of music. Where did I wasted all of that space? My HD is 185 GB.
Also, everytime I look at the used space, the bytes keep on changing. Does that means that every 20 seconds, the space is being taken away?

Not quite sure I understand your arithmetic. You started with a drive with a capacity of 185 GBs from which you created a Boot Camp partition of 32 GBs leaving 153 GBs. You then have your installed OS X and application software, and, I assume the pre-bundled software of about 16 GBs and 7 GBs of music which is 23 GBs leaving you with about 130 GBs of free space more or less.
OS X will continuously use disk space for cache files, temporary files, log files, VM files, safe sleep file, etc. So, at least based on what you've posted I don't see a problem.

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