In addition to the Boot volume and other non-volumes of your Mac, Stellar Volume Optimizer, also supports all removable storage media. Supports Repair for Mac External Hard Drives Stellar Volume Optimizer manages the journaling of individual non-boot volumes so that your Mac hard drive functions perfectly fine and you do not have to run for disk repair ever. If the journaling in any of the Mac volume is compromised, the volume goes into an inconsistent state, which later results in permanent disk damage. Journaling is very much essential to protect the integrity of the Mac OS Extended file system on individual volumes. Volume Journaling for Non-Boot Mac Volumes In addition, you can verify and repair the boot volume disk permissions as well. The software verifies all the disk permissions, checks for the inconsistency and repairs the incorrect disk permissions. Incorrect disk permissions result in data inaccessibility and loss of valuable information. The software replaces the directories with errors with the repaired ones so that the data, which are inaccessible earlier, can be regained. Stellar Volume Optimizer repairs damaged and corrupt directories of your Mac volumes.