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Go into Disk Utility, click your main drive, and click "Partition". Is there any "empty space" or "unused space" or whatever in the pie chart?

Feel free to share a screenshot.
 
Chances are, the only way you're getting that space back will be to do this:

1. Use either CarbonCopyCloner or SuperDuper to create a bootable cloned backup of your internal drive (the Mac partition, that is) on an EXTERNAL drive.

2. BOOT FROM the cloned backup.

3. Use Disk Utility to re-initialize the internal drive to HFS+ with journaling enabled, ONE partition.

4. Use CCC (or SD) to RE-clone the backup BACK TO the internal.

This WILL do the job, and do it right.
Takes a little time, though...
 
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Did you mouse over the line-graph elements? This may be "Purgeable" - try a google to understand more about this. (That is, it may not be "missing"
What does a cmd-i on the disk say?
Try something like Disk Inventory X to see if there is some blob someplace, such as a log file.
 
Did you mouse over the line-graph elements? This may be "Purgeable" - try a google to understand more about this. (That is, it may not be "missing"
What does a cmd-i on the disk say?
Try something like Disk Inventory X to see if there is some blob someplace, such as a log file.



Thanks all!

I ended up doing a complete reinstall of OS.... :/
 
It probably would have been fixable using command-line tools. Just for future reference. :)
 
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