As you can see OmniDiskSweeper could only find 112GB of Data. The same goes for the Programme WhatSize.
I don't know what these 143GB of music should be either. I've got 11GB of music in my iTunes library, and maybe 10GB of video files on my mac. The rest i pictures etc. Wherever I looked online it said that these programmes would tell me where my storage capacity is being eaten, but they all fail to do so. TimeCapsule function is switched off.
Hope someone can help.