![]() If you prefer to run a third-party repair utility, that is best performed by restarting from a suitably-prepared bootable USB memory stick, containing OS X, Disk Utility, and the third-party tool. Whatever type of storage – hard disk, SSD, or Fusion Drive – the only way to repair your startup volume is to restart into Recovery Mode (Command-R) and run Disk Utility from there. The startup volume cannot be repaired on two counts now: first, it cannot be unmounted, and second, as a live startup volume SIP prevents such repair. Although you can check a live mounted volume, if it requires repair it will have to be unmounted, so in general if you think there might be problems which need repair, you should go straight to repair – which requires the volume to be unmounted. ![]() ![]() With El Capitan, it has also become something of a complex step, depending on which drive you want to check, and the storage medium.Īll drive storage has at least two levels at which checks and repairs may be necessary: the whole-drive level, containing vital things like the partition map, and each volume’s file system, which is normally Mac Extended (HFS+). ![]() Establishing that a problem is not the result of such issues is often an important first step. The tables, directories and other structures required for drive storage systems are complex, and prone to error, and sometimes corruption.
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