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I tried to upgrade from Mac OS X 10.7 to OS X 10.10.3. During the install the process got stuck and didn't finish.
After booting to Recovery Mode I tried to make an image of the Macintosh HD volume onto an external drive in the hope to recover all my files.

System specs:

MacBook Pro 2011 13 inch 8 GB RAM 750 GB storage 250 GB used.
No backup.

Error messages:

  • 2
    Did you already try to boot to Recovery or Internet Recovery Mode to repair your system drive? – klanomath Jun 8 '15 at 6:23
  • You should really try to put some more effort and tell us what you did, and where do you get the error. – Matteo Jun 8 '15 at 6:24
  • @klanomath yesterday tried to install OSX 10.10.3 on a mac book pro mid 2011. installation starts and stucks immediately. holding cmd+L it said it could not find the keychain and hard drive failure. tried to restart holding shift would not work. boot to recovery worked verified disk, partition appears OK. reairing disk partition appears OK. Still wont install. – Sisu Jun 8 '15 at 15:32
  • @matteo hope the comment above helps more – Sisu Jun 8 '15 at 17:18
  • @klanomath trying to make an new image through disk utilities after booting into recovery failed. Stoped at Reading cosutmer (apple_HFS : 5)... (Output/input error). – Sisu Jun 8 '15 at 17:42
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Try using Target Disk Mode. Instructions here

With this you can turn your Mac into an hard drive. Just boot to TDM and connect your Mac and another Mac using a thunderbolt cable. You should then find the disk in finder.

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Try starting in Single user mode. Hold cmd+s during restart.

Let it finish and type

fsch -fy 

and let it run, and observe results of the disk repair attempt.

You’ll get a note at the end that says your drive is OK, or that it needs fixing. If it needs fixing, run the command again, until you get a notice that your drive appears to be OK. Once that happens, simply type:

reboot

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