Found hidden partitions?

I bought a macbook 2010 used pro 15 '' out of my high school, when I got it I tried to format the hard drive (500 GB) and install El Capitan, but when I did I noticed that only 274 GB of it was available, there is a "recovery" partition, taking up nearly half of my drive. When I saw him (the first and only time) I thought nothing of it and thought it might get dry with the rest of the disk, but it didn't. now I can't get the Debug menu to appear on the disk utility, and same terminal do not. I tried 3 or 4 lines of code to try and fix it but none of them work different, he thinks it's the Debug menu, but it's not. Help, please.

Please after the release of the following OS X Terminal commands.

diskutil list

Cs diskutil list

sudo TPG - vv - r see the/dev/disk0

Please enter your password when you are prompted by the command 'sudo '.

Tags: Notebooks

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