When the mac os x 10.5 hfs volume needs repair error message shows up on your Mac screen then you must have understood that then is some problem in the Mac drive. The corruption issue may have got in the drive by any error in the partitioning process, the drive may get infected by any virus, the file system gets damaged. So you should use the inbuilt disk utility when the mac os x 10.5 hfs volume needs repair. This will scan the Mac drive for inconsistency and will try to fix it but if the drive is not fixed then you will have to format the drive. The The formatted drive is functional can be used for storing data but first you should consider to restore the lost data after mac os x 10.5 hfs volume needs repair problem is fixed. You can do it with the help of time machine backup but in case it is not working then you can use the Mac data recovery software which will be able to scan the drive to find the lost files and then you can recover the file by selecting them from the preview. So download the software now.