How do I retrieve data from a HD that cannot be repaired with utility disk?

Hi,
I have a macbook pro 15 inch mid 2010. It has 4gb of ram and 500gb of storage. I recently upgraded to Mavericks OSX10.9,4.
First of all, when turning on my mac the screen just loads forever, hence it does not pick up the HD. It also displayed the circle with a line through icon once.
Upon noticing this, I tried to repair the disk but it said it was unable to. The other disks are ok but the MAC HD says it stopped repairing when I attempted to repair it.
Using single user mode (command + s): I tried this, but it continued to says the same i/o error code:
disk0s2: i/o error.n
0 [level 3] [facility com.apple.system.fs] [errtype IO] [IOType Read] [PBlkNum 57547320] [LBlkNum 67604]
0 [level 3] [facility com.apple.system.fs] [DevNode root_device] {mountPt /] [Path /private/var/db/dyld/dyld_shared_cache_x86_64]
And it kept going and going.
I'm afraid to try anything else. I have no Mac back up in time machine (I know) but I have an external. Is it possible to retrieve the data by wiping the external and using the utility disk to transfer to HD to the external? Is that what people call cloning? Is this physical damage/can i still recover the data/use it and section off the damaged parts and use the spare space?
Help would be appreciated!

i/o errors generally mean that a part of the disk cannot be read. That can prevent the disk mounting or prevent the entire disk being read after the error.
Disk Utility is not great at addressing issues like this & data recovery specialists are the safest (and most expensive) option for recovering data from a disk in this state.
As others have said it's critical to avoid any use of the disk since if it's a mechanical fault it could seize or finally give up functioning.
If you are intent on recovering 'on your own & on the cheap' you could look at ddrescue – it clones a disk by copying the data stream whilst ignoring errors from the source disk, the data on the second disk could be 'repairable' with additional tools.
http://www.gnu.org/software/ddrescue/ddrescue.html
TestDisk & Photorec are also good when used for the right fault.
http://www.cgsecurity.org
These are all *nix tools & require competence at the command line! Just installing can be too much for some non technical users.
You also need lots of spare disks to move data onto to run the tools.
Kappy, is CNET Downloads really a good recommendation? They have a habit of bundling other junk with third party app installers. Go straight to the vendors site would be my advice (using 'https' where available).

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|
|
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