Have you been noticing Mac OS X partition failed input output error? It is kind of problem that put you into serious trouble. Typically the issue appear while partitioning and restricts you to do so. By the way there could be various reasons responsible for this error, however whatsoever the reasons you must get rid of Mac OS X partition failed input output error. For doing so one can try repairing disk permission through disk utility, if this failed then running fsck command at single user mode is another option. Ultimately formatting hard drive is the more option to come out from this problem. But at the same time you need to understand that even if formatting will resolve Mac OS X partition failed input output error but there is data deletion emerge after doing so. Here you need to restore lost data which can be possible through Time Machine backup. Otherwise no need to panic because third party Mac Data Recovery comes into picture. This is the most reliable and secure way of bringing missing, formatted or lost data with ease. It is highly equipped with sophisticated recovery mechanism which makes it capable of dealing with every kind of data loss situation in Mac.