Smaller disk size after erasing of data


hi there

wanted make boot camp-partition on macbook pro (250 gb). reason is, university attend use windows-programs. started boot camp-assistent, , chose 200/50gb partitioning. after few minutes partitioning resulted in error, stating program couldn't move files. after quick google-research found had backup , erase disc (macintosh hd) , make new partition , re-install os x on it.
having done that, went boot camp-assistent again, realize disc size 227 gb!

question is: how come has disc size decreased , how 250 gb?

hope, can me, cause i'm quite useless when comes computers.
 

how did clean install of mac os x?
disk utility , show?
 


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