Mac volume needs repair is a common error issue encountered by Mac users. Generally, this type of problem experienced by users while accessing data from any particular volume on Mac. This very error is mainly caused due to any problem in boot volume. However there are some other reasons as well which can result in Mac volume needs repair error such as any kind of inconsistency in kernel file, any issue with disk utility etc. Due to this users are unable to access their important files from affected volume. It may also causes several other difficulties for Mac users such as boot failure, improper functioning of Mac system, slow system response and many more. In such situation several error messages frequently appears on the screen indicating that Mac volume needs repair. Fortunately this error can be fixed by repartitioning Mac system but you needs to be very careful while doing so. You should also backup all the important files carefully before you take any further action. However all your lost files can also be retrieved easily with the help of Mac Data Recovery Software. Therefore it is recommended to fix Mac volume needs repair error immediately before it cause any further damage to your system.