HFS volume needs repair is a common error message which users usually face while accessing their Mac system. It generally appears when there is a problem with boot volume, which can be usually caused due to improper formatting of Mac volume. Apart from that, HFS volume needs repair error also caused when there is some problem with the Kernel file and boot camp file system. Beside these, improper use of disk utility is equally responsible for HFS volume needs repair error. As a result, users complete loss their command from Mac system and start getting panicky. Moreover, when there is problem with Mac HFS volume, the Mac machine even denied to boot and fail to respond. Now, what you do to fix HFS volume needs repair error? If you don't have any idea then be relaxed. As you reached to the right place. In order to get rid of HFS partition error and to retain the working of Mac machine as before, users should have to firstly try “FSCK” command on recovery console. However, if the problem still persists then try to re-install your Mac OS X using the Mac bootable drive.
Note: It is necessary to have a proper backup of your data before trying above methods, because after re-installation all your saved files gets overwritten by a new one.