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A few weeks ago I installed OS X yosemite.I did it on the standard partition, but I had a dual-boot with ubuntu. I realised that the ubuntu boot was gone so I tried to redo it. But in disk utility, when i tried to make Macintosh HD smaller it gave a "Error: -69803: Couldn't modify partition map because file system verification failed "

How do I fix this, not just for dual booting but resizing partitions?

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Boot holding Command ⌘ R at the chimes to boot into Recovery Mode, run Disk Utility & Repair Disk.

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    Thank You.I tried Recovery mode but didn't know what repair disk did! – NotPseudonymous Dec 14 '14 at 13:37

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