Disk utility error 254 is a critical problem which is sometimes faced by Mac users. There can be various reasons behind it such as system crash, malware infection, bad disk sector, hardware or software issues etc. Whenever disk utility error 254 occurs users get major problem while accessing file and data. eventually all the data is lost if something is not done to resolve disk utility error 254. Don't worry there are some instruction which needs to be followed. Formatting or re-installing the Mac OS X can fix this problem. However, you should only proceed when there is a backup with you. Since it will erase all the previously stored data. If there is no backup of the data, try advanced Mac data recovery software to recover inaccessible data caused due to Disk utility error 254. It scans and repair the damage hard drive to restore the lost and inaccessible data.