Disk utilities gets stuck at 50 percent when erasing drive

I was supposed to format this for a friend but when I was formatting the drive with disk utility, it would get stuck at partitioning 50% and stay there.
Specs:
MacBook Pro "Core i5" 2.5 13" Mid-2012 2.5 GHz Core i5 (I5-3210M)
Intro Date: June 11, 2012 Disc Date: None
Order No: MD101LL/A Model No: A1278 (EMC 2554*)
Subfamily: Mid-2012 13" Model ID: MacBookPro9,2
Std RAM: 4 GB Std VRAM: 512 MB*
Std Storage: 500 GB (5400 RPM) Std Optical: 8X DL "SuperDrive"
I tried:
Installing via USB
Internet recovery
External optical drive
Swapping hard drive
Every method produced the same result, stuck at 50%.
Any suggestions?
Thanks

You can copy & remove data from Terminal in Recovery mode but frankly I'd use that as a last resort.
The safest option (make a bootable backup)…
In Recovery mode, Disk Utility.
Select the restore tab for the Macintosh HD, 'restore' that to a new disk.
Next best option (make a 'restorable' disk image)
In Recovery mode, Disk Utility.
Select 'File > New image > New image from Folder…'
Select the base of Macintosh HD as the folder
Save that as a compressed disk image on another disk.
You will have a clone of the entire disk inside disk image.
You can also use the second method to make a disk image of particular folders.
I'm not sure if this helps, but it sounds like you may be on the road with limited options?
You could contemplate installing OS X to the 150GB (assuming it is empty). Then you could boot from that if you need to get work done for a few days untill you are able to reinstall the internal disk.
Do you have any other user accounts? There are ways to create them, perhaps it is just your user data that is in a mess? Ask if you want info on that.

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