iMac is a desktop range of computers designed be Apple that runs on Mac OS X. If there is any inconsistency in the operating system or it starts giving error then you can use iMac recovery disk to deal with it. Mac OS X can get corrupted in several situations when the system was not closed properly, there is any Mac hard drive error or the system is badly infected by virus. There are chances that your system will not boot and you can not access any data stored in the Mac drive. You can take the help of iMac recovery disk which can recover all the system files and settings so that the system work properly. But there are cases where the iMac recovery disk does not work, in that case you have to manually reinstall the operating system in your iMac. If any of your important data is lost in the process then you can use the time machine backup and if it fails you are free to use the Mac data recovery software that will restore all your lost data in an easy manner. IMac recovery disk can be still used for the next time.