Why do i have a 'Recovery HD' after upgrading to lion?

I just realised, while i was doing a test of my machine using techtools delux, that it was scanning my 'Recovery HD', why is this so?

Hi,
The reasons are explained here. (ArsTechnica review of Lion).

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    Greetings Alex,
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  • My ipad mini is in recovery  mode after upgrading to ios 7. When i tried to restore it through itunes it says an error occured in restoring ... please help.......

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    Force iPad into Recovery Mode. Follow step 1 to 6 very closely.
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  • I have an iphone and after upgrading it`s system i can not open videos now.Please help me

    I have an iphone and after upgrading it`s system i can not open videos now.Please help me

    Trash the prefs in the preferences folder.
    Important Directories
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  • HT1688 Hello, I have iphone 4. After upgrade ios 7.0.2  lost vibro. Please, can you help me?

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    Basic troubleshooting
    Reset
    Restore with backup
    Restore as new ( better )

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