Difference between used disk space and folder space

My startup harddrive (an SSD) info gives that 88 GB are used. If I open it in OS X and look at info for all the folders in it, their summed used space is 24GB. Thus 64 GB are used to unknown purpose and cannot be used.
This problem seems to appear from using migration assistant to transfer from my old mac to a slightly newer. Both running Yosemite 10.10.1. I had to shutdown the migration because the computers seemed so lose contact with each other and the end of the migration seemed to go on for ever.

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