Dear Madame/Sir
I was updating my Mac desk by OS X after downloading it refuse to continue installation of OSX. The message appear to quite the installation and startup disk. The same message kept appearing.
I check the utility disk and gave me that error in the hard disk and I have to backup the data I could
Please advise the steps where I can make backup for my data. And how to reinstall the OS X in the system
Regards
If you failed to backup before starting the upgrade of OS X then that was a huge mistake.
If it will not start now, there is no way to backup.
The only possible way might be to remove the disk drive from your Mac and see if another Mac might be able to salvage any of your data.
There are several ways to back up a Mac that is not fully functional. You need an external hard drive or other storage device to hold the data.
1. Start up from the Recovery partition, from Internet Recovery, or from a local Time Machine backup volume (option key at startup.) Launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
If you use FileVault 2, then you must first unlock the startup volume. Select its icon ("Macintosh HD," unless you gave it a different name.) It will be nested below another disk icon, usually with the same name. Click the Unlock button in the toolbar. Enter your login password when prompted.
2. If Method 1 fails because of disk errors, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
3. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
4. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Backup of non bootable OS X
