If you retry the process after updating Mac OS X operating system, you see only one partition as before.

When you reboot the system, by exiting the process, you see only a black gray screen, without any option to proceed.

This problem may occur due to missing or damaged Mac OS X system files, file system, and other data structures. At this point, you need to perform Mac file Recovery by resolving this problem, to get your data recovered.

Solution

You can the following methods to work around this problem:

1)  Boot from bootable DVD of Mac OS X, holding C or D keys.

2) Reboot the system, holding ‘Option’ key.

3) Boot the system with bootable external FireWire drive, hold ‘Option’ key.

4) Start your system in Target Disk Mode by attaching to another Mac computer.

5) Reset NVRAM (Non-Volatile Random Access Memory).

6) Try booting Mac system in Safe Mode.

7) Boot the system in Single User Mode or Verbose Mode.

If your system is unbootable and inaccessible, after applying above fixes, hard drive formatting and operating system reinstallation are the only way left. But formatting removes all hard drive data and it becomes essential to perform Data Recovery Mac to retrieve critical data.

Recovery is possible with the help of efficient and powerful third-party Mac disk recovery Software. They perform absolute recovery in all cases of data loss, through high-end scanning methods.

Stellar Phoenix Macintosh Data Recovery ensures absolute recovery of all types of lost Mac files. The software recovers lost data from HFS, HFS+, HFSX, HFS Wrapper, and FAT file system volumes. It is compatible with Mac OS X 10.6 Snow Leopard, 10.5 Leopard, 10.4 Tiger, and 10.3.9 Panther. scienceshops.