The course of data recovery is different on every operating system. When you need to get your lost files back, you will have to use data recovery software which is supportive to the combination of your operating system and file system.

Most of the software companies, either of application software or system software, release the periodic updates on their products. Like all other companies, Apple also gives chance to its customers to avail advanced features by releasing the newer file versions of Mac operating system.

When attempting to start up Mac OS X, you may come across one or more of the following symptoms:
Your Mac stops responding during startup
Setup Assistant rematerializes
BSD (Berkeley Software Distribution) commands which access files in var and etc fail
A message box appears with the message which contains: “/etc/master.passwd: no such file or directory.”