hard drive - How to shrink volume on an SSD?

How do I shrink an SSD partition? When I try to shrink the volume, the "available amount of space to shrink" is zero. I did a disk defragmentation (I know it's bad), but it still comes up with zero. Any tips or pointers?

I am using Windows 7, Vertex 2 240 GB, MacBook Pro, NTFS, and I have about 70 GB used. I also turned off hibernation and turned off paging to reduce large files.

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