Partition my HD with Lion but it comes up with an error"

I'm trying to partition my HD with Lion but it comes up with an error" couldn't modify partition map because file system verification failed.
i have verified permissions and repair them all check out good. Any ideas?

Ok try this.
Get a copy of your users file data folders (Music, Docs etc) off the machine onto a storage drive and disconnect it.
Do this in addtition to TimeMachine or clone backups, you need to have two copies and TM drives are not quite as easily accesible and can get corrupted.
1: Boot into Recovery HD (hold command and r keys down) and use Disk Utility to First Aid >Repair the drive, see if that works if it can't repair the drive, you have a more serious issue. If it does repair the drive, do it again until nothing is repaired.
2: Next use Disk Utility to Erase Free Space with Zero option on the Macintosh HD partition, this will map off bad sectors as DU will check the file it created for errors. 
(#1 and #2 here fixed my issue trying to create a  partiton when DU failed.)
3: Try to create your new partiton again, I suggest you use the BootCamp software partitoning portion as it's drop dead easy and you can later use Disk Utility to change the format from MSDOS to something else, like OS X Extended for installing OS X or whatever format you require.
Or by Windows 7 installer which will change the format to NTFS for boot Windows in BootCamp.
Drives, partitions, formatting w/Mac's + PC's
https://www.apple.com/support/bootcamp/
If DU doesn't repair the drive, next create a Recovery USB following these instructions and option key boot off of it and run Disk Utility on the entire drive to repair it.
http://osxdaily.com/2011/08/08/lion-recovery-disk-assistant-tool-makes-external- lion-boot-recovery-drives/
If you can't repair the drive, your going to have to use Disk Utility on the USB to Erase with Security Zero Erase, (that's one step from the right selection), the ENTIRE drive (select the drive makers name and size on the right).
This will rebuild your partiton map (which can only be done booted from a external source) and fix your entire drive of bad sectors.
Now use the USB to reinstall Lion and Recovery from Apple's servers, you will need your AppleID and password,  plus a fast relaible Internet connection.
Next install your iLife by reading here
https://support.apple.com/kb/HT4718
Install your programs from original sources and create accounts with the same name, then return files from the storage drive you made earlier.
You can read about bad sectors on hard drives here
Reducing bad sectors effect on hard drives

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