• Stellar Volume Optimizer

Stellar Volume Optimizer

Repair & Rebuilds corrupt Mac hard disk drive


Professional Mac disk Repair software that repairs volume errors, rebuilds any damaged directory, and replaces the old directory with the new one to get your Mac backup and running. The software checks for errors in catalog file, multi-linked files, extents overflow file, journaled files, volume bitmap, and volume information.

  • Overhaul wide range of OS X disk errors
  • Rebuilds damaged volume directory
  • Repair disk permission on Mac
  • Option to roll back a volume to its previous state
  • User-friendly and robust Mac drive repair tool
  • Compatible with macOS Sierra

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Key Features

Volume Repair software helps user fix number of HFS disk issues and create boot DVD to startup inaccessible Mac. Let us quickly walk through some of the salient features of this utility:

Repair Mac Volume Errors  icon

Repair Mac Volume Errors

The software is capable of correcting a range of volume errors (such as 'Invalid key length', 'Invalid index key') in Mac in order for resolving problems faced while opening, saving, or deleting files on a Mac OS X volume. Minor disk errors are repaired without having to rebuild the directory.

Rebuilds Volume Directory  icon

Rebuilds Volume Directory

If your directory is not updated regularly or is damaged, this repair tool tends to rebuild the entire volume directory and replaces the damaged directory with the newly created one. The tool helps to mount a severely corrupt Mac volume and make all your seemingly lost data accessible.

'Rollback' Option in Preferences  icon

'Rollback' Option in Preferences

The software ensures that your volume is repaired in almost every case of OS X directory corruption. If a volume is severely damaged and it fails to repair, this OS X drive repair tool allows you to roll back the volume to its previous state. You can enable 'Rollback' property by setting preferences in the software.

Creates Bootable DVD  icon

Creates Bootable DVD

If you need to repair the startup disk of your Mac, the software gives you choice to create a bootable DVD. You can boot your system from this disc and fix your boot volume. If your Mac is unbootable, you can create bootable DVD on another system with similar configuration and then boot your Mac through this disc to rebuild the corrupt volume directory.

Repair Mac Disk Permissions icon

Repair Mac Disk Permissions

The software can be used to verify & repair permissions on all bootable volumes in your system that contains any OS X. This helps you to easily identify and address issues with various Apple-originated files and folders stored on the boot volume of your Mac.

Easy-to-Use and Interactive Interface icon

Easy-to-Use and Interactive Interface

This repair utility provides a handful of options to make the overall process easy, fast, and convenient for the users. You can set preferences in the software for update and rollback options. The interface of the tool is designed to give you the look and feel of Mac OS.

Repair External Hard Drive Mac icon

Repair External Hard Drive Mac

This disk repair software for Mac rebuilds corrupt directory structure of HFS formatted external hard drives. Connect your external drive to Mac and repair cryptic disk errors such as Invalid B-tree node. This software also repairs corrupt external solid state drives.




The 'Demo' version of the software enables you to create a bootable DVD and scan Mac OS X volumes to find out if a repair is needed. To repair and rebuild the corrupt volume directory, you need to purchase the software.


Directory corruption is typically manifested by various error messages. A few are given below:

‘Invalid key length’

‘Invalid index key’

‘Invalid leaf record count’

Other signs include issues while opening, saving, or deleting file on the volume. In other cases, your Mac will refuse to boot up.


Yes, routine usage of the software may help you resolve any minor volume corruption early before it turns into a major problem.


First of all, create a bootable DVD using the tool on another system that has a similar hardware configuration as your Mac and then use this bootable disc to boot your troubled Mac and rebuild the corrupt directory of your system.


Yes, you can run Stellar Volume Repair to fix an external hard drive, which is HFS formatted. It won't repair a disk formatted with NTFS and FAT. It also repairs Apple formatted solid-state drives.


Start repairing the corrupt Mac disk with Stellar Volume Repair application to rebuilds its damaged directory structure. If your startup disks i.e. Macintosh HD is corrupt, then you first need to create a bootable media with the Volume Repair software to repair Mac hard drive.


No, it doesn’t support repairing of RAID drives.


To check on offer or discount running on this software, Click Buy Now.

Rating & Reviews


4.6 out of 5 stars


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User Comments



It got back an HFS partition back to life. I can't express my excitement seeing the drive up and running as usual. Thanks



My Mac had a troubled HDD. I tried my best:

*Repairing Mac in safe mode but didn’t make it.
*Booting into Recovery Mode but every time it restarts itself.

Went to a computer repair store and they said to replace the hard drive. I kept HD replacement as my last option. But before a replacement could happen I created bootable USB and repaired the startup disk drive with Volume Repair. The software took almost a day to scan, rebuild my corrupt disk but it successfully repaired the media. I have my Mac running again, and I feel the drive could live for some time. Happy I tried your application.



I gave up all my hope in repairing corrupt Solid State external hard drive 256 GB but Stellar Volume Optimizer brought it back 2 life. It literally saved me from losing files and the storage disk.



Bought an enclosure for my failed WD External 1 TB hard drive but still it failed to mount. Tried FSCK but didn't worked and almost all techniques failed until I ran Volume Repair. When are you adding macOS Sierra support?

Richard K. Quintana


I work with plenty of Mac OS Journaled hard drives. Though rarely but disk corruption occurs on my hard drives. I tried every single software that claims to repair Mac drive. Among all of them, I found Stellar Volume Repair the best for a couple of reasons (1) It covers up more than 30 cryptic disk errors (2) the software isn't overly priced, unlike other repair tools.

Andrew Adair


Stellar Volume Repair is an absolute answer to all those utilities that not just ask a high price for Mac hard disk repair but also don’t seem to perform as promised. I indeed recommend using this software as a perfect Disk Utility alternative. Moreover, you save around $50 with this application.



A great piece of application that worked on OS X Journaled hard drives. Another best part of this utility is its affordable price. Other software does the same task in almost double price tag. There is no point spending almost $100 in other product when Volume Optimizer can repair Mac in half the price

John D. Griffin


Stellar Volume Repair saved my Macintosh HD from going into a vegetative state. This software has an impressive built in technology that can repair the corruption on a Mac formatted disk. It saved my bacon on two occasions.



This product is a genius. It got rid of Invalid B tree node disk error on my Western Digital 1 TB hard drive. The UI is simple and documentation is appropriate. Since my drive was an external I didn’t require to create a bootable USB however I do keep a boot disk handy so that my startup disk is taken care of, when required.

Martin Siems


I wanted my old 500 Gb Seagate hard drive to run as Time Machine backup drive but when I connected it to Mac it asked me to initialize it. I checked with Disk Utility and found that the disk is corrupt and giving me error “Invalid B Tree Node”. I forbid to format it since it has some files on it which I wanted them before formatting it for Time Machine disk. I checked with other tools and data recovery services but that were too costly to avail. Luckily got to know about the Stellar Volume Repair software through their website. I called up the support to confirm about repairing the drives, which they responded positively. True, the software did fix up my drive and I successfully used it as the Time Machine disk. I called up support after the repair and couldn’t stop thanking them.



Thanks to Stellar Volume Repair, I fixed InvalidIndex key problem on my startup disk running Yosemite 10.10.3. Eagerly waiting for the El Capitan support.

Corey H. Beall


Almost saved a dying Macintosh HD by repairing it to extent where I can access all my data and backup to another media. It did in half the price of Disk Warrior. Simply Great.

Carl L. Smith


My USB 2.0 external hard drive with two HFS partition failed to mount on OS X Yosemite. I ran Disk utility and it reported back as error stating “backup as much as possible to other drive”. My data was still on the drive so couldn’t format the external drive in order to kill the error.

Installed and ran Stellar Volume Repair application and it verified the disk for rebuilding its damaged directory structure. Few hours later, the software completed the disk repair tasks and mounted the partitions on the desktop. At the very beginning, I didn’t even think of repairing something, which was beyond my knowledge but thanks to this tools that empowers user with resource & knowledge.

Mark Rios


I found a great difference in repairing the bad disk permissions with Disk Utility and Stellar Volume Repair tool. The latter outperforms Mac’s own disk permission repair. I found my apps were significantly faster after I repaired them for the first time with Volume Repair tool. A month later, found the same improvement with software’s disk permission repair feature.

Ramon Ponce


Stellar Volume Repair 2.0 is far better than 1.0 in repairing Mac hard drive. Software now let’s you know about the drive repair process, which was badly missing in the version 1.0. However, the repair power is updated which is a good sign. I repaired my SSD 25GB drive and it rebuilds it within a couple of hours. The free disk permission repair is also a nice add on and much powered than the mighty disk utility. Overall, this is the software that can save a disk from getting toast.


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