Mac Error

I am facing an error while starting my Macbook pro. The operating system is osx 10.10

I have attached the screenshot. Can someone please suggest a way to fix this.

IMPORTANT: I need all my data and can't afford to lose any of it.
Screen-Shot-2015-08-03-at-3.46.37-pm.png
smuralisankarAsked:
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strungCommented:
You have disk directory corruption.

Reboot while holding down the Command-r key combination.

Then pull down the Utilities menu to Disk Utility and select Repair Disk.

Let us know if the disk is repaired successfully. If not, we will give you some options.
Scott CSenior EngineerCommented:
Do you have a backup of your important files?
smuralisankarAuthor Commented:
You have disk directory corruption.

Reboot while holding down the Command-r key combination.

Then pull down the Utilities menu to Disk Utility and select Repair Disk.

Let us know if the disk is repaired successfully. If not, we will give you some options.

That is what I tried. The result of that is what I posted in the screenshot.



Do you have a backup of your important files?

Unfortunately only a few files were backed up. I need all my data as well as browser (bookmarks and history).
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Scott CSenior EngineerCommented:
You can take a  look at these data recovery utilites for Mac.

http://www.techrepublic.com/article/3-data-recovery-applications-for-os-x/

If those won't work, or you want the best chance of recovering your important data, Do a Google search on "mac data recovery service".  Make sure they have a pay only if data is recovered policy.
Scott CSenior EngineerCommented:
Another thing to try is to slave the drive off of a PC, and boot with a live distro of Knoppix.

Knoppix can read just about any file system.

If the drive can be read, use Knoppix to copy the important data to a flash drive or USB drive.

http://www.knopper.net/knoppix/index-en.html
strungCommented:
The first thing you need to know is whether your drive is simply badly corrupted or needs replacing.

If your drive is not an SSD drive, then reboot into recovery mode and open Disk Utility and look to see what it reports as the S.M.A.R.T. status of your drive when you click on the main volume (500 GB Mass Storage). If S.M.A.R.T. shows as "verified"  your disk is probably physically okay and is repairable. If it does not show "verified" you are going to have to replace the drive. (S.M.A.R.T. does not work with SSD drives)

Notwithstanding what others have posted, I would avoid trying to recover to a PC or use non-Mac tools to recover.

Assuming that the S.M.A.R.T. report is "verified", then you need to buy an external USB3 drive to connect to your Mac to recover your data and to use a  backup drive going forward.

Connect the new drive and reboot into recovery mode and then use it to erase and reformat the new drive as "Apple Extended Format (Journalled)". (By default it will be formatted in a PC format like FAT32 or NTFS which won't work with a Mac.)

Name the new volume you are creating "Backup"

Once that is done, in Disk Utility, hit the restore tab and restore you old drive  "Macintosh HD" to your external drive "Backup"

This may take several hours, but unless your drive is really badly damaged, it should work.

Once it is done, Reboot holding down the Option key. This should bring up the boot picker and give you the option to boot using the Backup volume. This will be slow, because USB is slower than your internal bus.

If it boots, satisfy yourself that everything you need is on it.

Once you are satisfied that everything you need is on it, shut down and unplug it.

Reboot into recovery mode and go back into disk utility. This time, erase your internal drive (Macintosh HD) and format it as Apple Extended Format (Journalled), naming it Macintosh HD.

Then continue and install a new operating system on to MacIntosh HD.  During the installation process it will ask you if you have any data you wish to recover. At that point, connect the external drive and follow the instructions to migrate all your data, settings and apps back from the backup volume to your internal drive.

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serialbandCommented:
If you want a free method and you have a spinning disk, I suggest you get another 500 GB or larger disk and just duplicate it using Roadkl's Raw Copy from a Windows system.  This should be fine to use since its a raw disk copy and just duplicates everything onto another disk.  You'll get everything except the bad sector, and likely get well over 99% of it.  It's mainly a few bad sectors causing too many S.M.A.R.T. errors that stop the process with most programs.  Unless your disk was already running 24/7 for Don't keep running the drive until you're ready to duplicate it, or errors may accumulate.
http://www.roadkil.net/program.php?ProgramID=22

If this was a Windows system, I would have suggested Roadkil's Unstoppable Copier.  It can continue reading a disk with errors.

There isn't currently a comparable free or open source software to do the same thing on a Mac.  I've had success with the free TestDisk/PhotoRec, but it puts data into it's own format and it recovers every inode, so you'll have to sort it yourself and figure out the names of the files.  http://www.cgsecurity.org/wiki/TestDisk

You should always be backing up data, no matter which platform you use.  At least with Windows, if you forget, there are ways to easily recover you data, if you skipped a backup cycle, without having to pay more money.
David AndersTechnician Commented:
Alsoft's Diskwarrior will be able to repair the drive. I have been using it for 14 years. I seldom fails if the drive mounts.  A Google for Diskwarrior will verify it's wonderfulness.
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