It is quite unfortunate when you come across situation like OS X Yosemite installation error: File system verify or repair failed. This problem could take place while upgrading the OS X to Yosemite. Well the issue is really critical because it won't let you to upgrade and bother you extensively. As a user you need to upgrading your Mac to include the system with latest functionalities, but sometimes due to wrong upgrading or other unfavorable factors would put you into troublesome. One similar incident has been reporting during upgrade and which is OS X Yosemite installation error: File system verify or repair failed. So you need to take appropriate course of action for resolving the issue. Here you can attempt running disk utility in which verify/repair as well as repair disk permissions. And then reboot Mac normally, hope this way you can resolve the issue. But do not forgot to backup the volume with Time Machine, if you forgotten to do after resolving OS X Yosemite installation error: File system verify or repair failed then no need to get disappointed because here Mac Data Recovery Software can be taken into consideration for data recovery. This is the proficient tool for retrieving lost, corrupted or lost Mac data.
