HT4718 i need to install a fresh copy of OS X onto my macbook pro 13. i did erase the old partition "macintosh hd" & now when i am trying to create a new partition, it shows "partition failed..couldnt unmount disk"...pls help !!

i need to install a fresh copy of OS X onto my macbook pro 13. i did erase the old partition "macintosh hd" & now when i am trying to create a new partition, it shows "partition failed..couldnt unmount disk"...pls help !!

First of all, I have to ask, why to you "need" to install a fresh copy of OSX?
This may mean that your hard drive is failing, so hopefully you have a backup.
I'm assuming you were in your recovery partition when you did this.
I would, from the recovery partition, repair your hard drive and permissions.
When to Run First Aid in Mountain Lion's Disk Utility - For Dummies
And then try to create the partition again.
If that doesn't work, you have a few options:
Try a third party utility like DiskWarrior or TechTool which may be able to repair your hard drive:
DiskWarrior 4 - The Disk Utility for Mac Disk Repair, Mac Directory Repair, Mac Disk Recovery, Mac Data Recovery or Techtool Pro 7
Try internet recovery, perhaps erase the entire hard drive and reinstall ML.
If nothing else works, then I'd replace the HD and start over.

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