You must take proper course of action after seeing Mac volume file system error. There might be some scenarios in which Mac volume goes non functional or unresponsive due to known or unknown causes. Many time it has been found that because of wrong partitioning of drive, resizing volume improperly, volume header corruption and so on would cause Mac volume file system error. In consequences of volume error you perhaps encounter severe data loss as well. In order to get rid of this catastrophic situation one can try disk utility. For repairing disks, disk utility can be utilized. In addition repairing through command line is possible through fsck wherein you need to type /sbin/fsck -fy. Do not forgot to restart system in single user mode by using (Command+S on boot).
Thus Mac volume file system error can be easily fixed. But at same time it is always good to backup the volume before accomplishing repairing to drive. Unfortunately it has been reported that users do not backed up drive because of someway. In that critical moment you may even face dire file missing circumstance. No need to panic with Mac Data Recovery Software you can overcome easily from Mac data loss. So, now you no longer have to worry on how to fix Mac volume file system error.