It is very necessary to fix Mac corrupt partition because the might be some important files saved in it that you don't want to lost at any cost. The Mac partition in the drive should be created only with the inbuilt disk utility because if you have used the third party tool then the chances for corruption are more. But even if you have used the disk utility sometimes due to the abrupt shut down of the system or crashing of it the partitioning process gets interrupted and it gets corrupted. All of the data becomes inaccessible and there is also a possibility that the Mac operating system will not get loaded. You can try to use the disk utility even if the system does not start to fix Mac corrupt partition and if it is not fixed then format the drive. The data can be recovered from the time machine backup and when the time machine fails you can use the Mac data recovery software. You need to scan the drive when you have fix Mac corrupt partition, it will provide the list of recoverable files and you can select them for recovery. So download the software now and fix this.