Macbook pro not booting after software update

Dear all,
Since two days ago my macbook pro hangs at the gray apple screen, the round circle keeps on turning. Kept it running for nights but it does not exit this status. I read on the internet that I could run it in verbose mode, that's what I did, see screenshot below. What do you recommend? This seems to be a hard disk issue. How can I boot up in safe mode and possibly recover the hard disk data? Any other recommendations?
Thanks,

Get your Mac to a Computer repair service, or do it yourself. You will need to put it in an external SATA reader, like I did. I recovered files via an older mac running Slow Leopard and copied files to it.
What I did:
1. You will have to remove the screws at the bottom of your Mac, in order to get to the HDD (or SSD, whatever you have).
2. You need to remove the HDD and put it in an external Case/SATA reader
3. Copy files from your HDD to another Mac
4. On that other Mac, go to Disk Utility (search in spotlight) and Erase as 'Mac OS X Extended (Journaled)'
5. Download Mountain lion on another Mac from the AppStore, and go to that Applications folder.
6. Right click on the downloaded file and select “Show Package Contents”. Go to “Contents” and jump inside the “SharedSupport” folder and you’ll find a file titled “InstallESD.dmg”. Copy this over to the desktop.
7. Plug in a USB flash drive to your Mac having at least 4GB memory. We highly suggest going ahead with an 8GB one just to be on the safe side.
8. Now open up “Disk Utility” and drag InstallESD.dmg from the desktop to the left-hand sidebar. Select the attached USB from left side and click on “Partition” tab.
9. Select “1 Partition” from the Volume Scheme dropdown menu. Choose “Mac OS Extended (Journaled)” from the left.
10. Now click on “Option” at the bottom. Select “GUID Partition Table” and press OK. Now click on Apply at the bottom right to start formatting.. (NOTE: This is will erase all data on your USB flash drive)
11. Once the drive has been formatted, click on “Restore” (it’s right next to where you clicked on “Partition in Step 5).
12. Choose USB drive you plugged-in in Step 5 as “Destination” with the InstallESD.dmg file as “Source”.
13. Click Restore and type in your password (if you have any). This will create the intended Lion bootable USB flash drive
14. Reboot your Mac with the USB drive plugged in. Hold the “Option” key on your keyboard when you hear the iconic OS X startup chime. You can now boot into your Flash drive from there.
15. Follow the on-screen instructions to install OS X , and after that, reboot
16. Format USB back to FAT in Disk Utility, copy your files from old PC to new using the USB.
That's it, you're done . Takes a lot of time, but recovered my Mac this way!

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