My MacBook Pro has a 500GB Hard Drive (HD), but when I search my capacity I says that I only have 384.99 GBs of capacity. Where are the other 100GBs?

My Mac has been a little slow, so I figured that I should make sure that I have enough storage capacity on my Hard Drive (HD). In doing so I realized that my HD is missing 100GB of space capacity. I thought that my HD was supposed to at least 499.25 of available space.
When using "About this Mac", it clearly shows that I only have 384.99 GB of capacity.
Where are the other 100 GB? I should mention that I recently deleted a partition for that same amount of storage. That has to have something to do with this? Can you help me?
About My Mac:
OS X Yosemite
Version 10.10.1
MacBook Pro (15"-inch, Early 2011)
Processor: 2GHz Intel Core i7
Memory: 4GB 1333 MHz DDR3
Dish Description: TOSHIBA MK5065GSXF Media

Discrepancy in calculating space between Finder and Disk Utility
“Finder does not take into account the  Backups/ local snapshots,
but disk utility includes them.”
http://pondini.org/TM/30.html
Disk space / Time Machine ?/ Local Snapshots
Local backups
http://support.apple.com/kb/ht4878

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