Can't format internal hdd

Hi,
At the moment OS X is located on external hdd. I want to format the internal drive and install OS X there, but I can't:
Disk utility says:
2013-04-21 03:53:07 +0700: Verifying partition map for “ST31000528AS Media”
2013-04-21 03:53:07 +0700: Starting verification tool:
2013-04-21 03:53:07 +0700: Checking prerequisites
2013-04-21 03:53:08 +0700: Checking the partition list
2013-04-21 03:53:08 +0700: Checking for an EFI system partition
2013-04-21 03:53:08 +0700: Checking the EFI system partition’s size
2013-04-21 03:53:08 +0700: Checking the EFI system partition’s file system
2013-04-21 03:53:08 +0700: Checking all HFS data partition loader spaces
2013-04-21 03:53:08 +0700: Checking Core Storage Physical Volume partitions
2013-04-21 03:53:08 +0700: Checking storage system
2013-04-21 03:53:08 +0700: Checking volume.
2013-04-21 03:53:08 +0700: disk0s2: Scan for Volume Headers
2013-04-21 03:53:08 +0700: disk0s2: Scan for Disk Labels
2013-04-21 03:53:08 +0700: Logical Volume Group 80EEA382-7772-4893-B31E-A6038DBC1D34 on 1 device
2013-04-21 03:53:08 +0700: disk0s2: Scan for Metadata Volume
2013-04-21 03:53:08 +0700: Logical Volume Group has a 16 MB Metadata Volume with double redundancy
2013-04-21 03:53:08 +0700: Start scanning metadata for a valid checkpoint
2013-04-21 03:53:08 +0700: Load and verify Segment Headers
2013-04-21 03:53:08 +0700: Load and verify Checkpoint Payload
2013-04-21 03:53:08 +0700: Load and verify Transaction Segment
2013-04-21 03:53:08 +0700: Load and verify Transaction Segment
2013-04-21 03:53:08 +0700: Load and verify Transaction Segment
2013-04-21 03:53:08 +0700: Load and verify Transaction Segment
2013-04-21 03:53:08 +0700: Incorporate 3 newer non-checkpoint transactions
2013-04-21 03:53:08 +0700: Load and verify Virtual Address Table
2013-04-21 03:53:08 +0700: Load and verify Segment Usage Table
2013-04-21 03:53:08 +0700: Load and verify Metadata Superblock
2013-04-21 03:53:08 +0700: Load and verify Logical Volumes B-Trees
2013-04-21 03:53:08 +0700: Logical Volume Group contains 0 Logical Volumes
2013-04-21 03:53:08 +0700: Load and verify Freespace Summary
2013-04-21 03:53:08 +0700: Load and verify Block Accounting
2013-04-21 03:53:08 +0700: Load and verify Live Virtual Addresses
2013-04-21 03:53:08 +0700: Unable to bootstrap transaction group 260523: inconsistent crosscheck
2013-04-21 03:53:08 +0700: Continue scanning metadata for an older checkpoint
2013-04-21 03:53:08 +0700: Load and verify Segment Headers
2013-04-21 03:53:08 +0700: Load and verify Checkpoint Payload
2013-04-21 03:53:08 +0700: Load and verify Transaction Segment
2013-04-21 03:53:08 +0700: Incorporate 0 newer non-checkpoint transactions
2013-04-21 03:53:08 +0700: Load and verify Virtual Address Table
2013-04-21 03:53:08 +0700: Load and verify Segment Usage Table
2013-04-21 03:53:08 +0700: Load and verify Metadata Superblock
2013-04-21 03:53:08 +0700: Load and verify Logical Volumes B-Trees
2013-04-21 03:53:08 +0700: Logical Volume Group contains 0 Logical Volumes
2013-04-21 03:53:08 +0700: Load and verify Freespace Summary
2013-04-21 03:53:08 +0700: Load and verify Block Accounting
2013-04-21 03:53:08 +0700: Load and verify Live Virtual Addresses
2013-04-21 03:53:08 +0700: Unable to bootstrap transaction group 260522: inconsistent crosscheck
2013-04-21 03:53:08 +0700: Continue scanning metadata for an older checkpoint
2013-04-21 03:53:08 +0700: Load and verify Segment Headers
2013-04-21 03:53:08 +0700: Load and verify Checkpoint Payload
2013-04-21 03:53:08 +0700: Load and verify Transaction Segment
2013-04-21 03:53:08 +0700: Incorporate 0 newer non-checkpoint transactions
2013-04-21 03:53:08 +0700: Load and verify Virtual Address Table
2013-04-21 03:53:08 +0700: Load and verify Segment Usage Table
2013-04-21 03:53:08 +0700: Load and verify Metadata Superblock
2013-04-21 03:53:08 +0700: Load and verify Logical Volumes B-Trees
2013-04-21 03:53:08 +0700: Logical Volume Group contains 0 Logical Volumes
2013-04-21 03:53:08 +0700: Load and verify Freespace Summary
2013-04-21 03:53:08 +0700: Load and verify Block Accounting
2013-04-21 03:53:08 +0700: Load and verify Live Virtual Addresses
2013-04-21 03:53:08 +0700: Unable to bootstrap transaction group 260521: inconsistent crosscheck
2013-04-21 03:53:08 +0700: Continue scanning metadata for an older checkpoint
2013-04-21 03:53:08 +0700: Load and verify Segment Headers
2013-04-21 03:53:08 +0700: Load and verify Checkpoint Payload
2013-04-21 03:53:08 +0700: Load and verify Transaction Segment
2013-04-21 03:53:08 +0700: Incorporate 0 newer non-checkpoint transactions
2013-04-21 03:53:08 +0700: Load and verify Virtual Address Table
2013-04-21 03:53:08 +0700: Load and verify Segment Usage Table
2013-04-21 03:53:08 +0700: Load and verify Metadata Superblock
2013-04-21 03:53:08 +0700: Load and verify Logical Volumes B-Trees
2013-04-21 03:53:08 +0700: Logical Volume Group contains 0 Logical Volumes
2013-04-21 03:53:08 +0700: Load and verify Freespace Summary
2013-04-21 03:53:08 +0700: Load and verify Block Accounting
2013-04-21 03:53:08 +0700: Load and verify Live Virtual Addresses
2013-04-21 03:53:08 +0700: Unable to bootstrap transaction group 260520: inconsistent crosscheck
2013-04-21 03:53:08 +0700: No valid commit checkpoint found
2013-04-21 03:53:08 +0700: The volume 80EEA382-7772-4893-B31E-A6038DBC1D34 was found corrupt and needs to be repaired.
2013-04-21 03:53:08 +0700: Problems were found with the partition map which might prevent booting
2013-04-21 03:53:08 +0700: Error: This disk needs to be repaired. Click Repair Disk.2013-04-21 03:53:08 +0700:
2013-04-21 03:53:08 +0700: : This disk needs to be repaired. Click Repair Disk.
2013-04-21 03:53:08 +0700: Verifying volume “BOOTCAMP”
2013-04-21 03:53:08 +0700: Starting verification tool:
2013-04-21 03:53:08 +0700: Checking file system2013-04-21 03:53:08 +0700: Checking volume.
2013-04-21 03:53:08 +0700: Checking main boot region.
2013-04-21 03:53:08 +0700: Checking system files.
2013-04-21 03:53:08 +0700: Volume name is BOOTCAMP.
2013-04-21 03:53:08 +0700: Checking upper case translation table.
2013-04-21 03:53:08 +0700: Checking file system hierarchy.
2013-04-21 03:53:08 +0700: Checking active bitmap.
2013-04-21 03:53:08 +0700: Rechecking main boot region.
2013-04-21 03:53:08 +0700: Rechecking alternate boot region.
2013-04-21 03:53:08 +0700: The volume BOOTCAMP appears to be OK.
2013-04-21 03:53:08 +0700: Repair tool completed:
2013-04-21 03:53:08 +0700:
2013-04-21 03:53:08 +0700:
And it can't be repaired in disk utility.
But I can load Win7 from bootcamp partition and it works perfectly.
Please, help me to find out how to erase internal hdd.

Are you trying to repartition the drive? Remove the Boot Camp partition only using Boot Camp Assistant.
If you are trying ERASE the OS X volume/partition and reinstall Mountain Lion from scratch:
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
        the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

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