There's your answer. You've got a lot of slack space. Disk space isn't allocated down the bit, its allocated in clusters (often between 1k to 32k in size). That means that even if you have a file that is smaller than your cluster size, the remainder of the cluster is unusable. For large files this isn't a problem as they'll fill several clusters competely and the last cluster partially. For small files, this can lead to very inefficient use of the disk.
If this is a problem, you might want to consider tar'ing/zipping the files or changing your file system around to use smaller clusters.
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