• Stellar Drive Defrag

Stellar Drive Defrag

Mac Defrag tool helps improve data access speed and system performance by defragging Mac files on hard drive including the Boot volume


Professional Mac Defrag software, which searches for all scattered fragments of data on a Mac volume and effectively organizes them to occupy contiguous storage locations for improved data access speed and optimal performance.

  • Optimizes the free space in a hard drive into contiguous memory space
  • Impressive option to apply colors to similar blocks while defragmentation
  • Can monitor the temperature fluctuation of the drive while defragmentation
  • Support defragging of Encrypted Hard drives & file-systems
  • Compatible with the latest OS X El Capitan 10.11 and below versions
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Key Features

Stellar Drive Defrag has dedicated algorithms to logically group all scattered pieces of large data files present on your Mac hard drive and store them in contiguous segments on the drive. Some salient features of the software are illustrated below:

Free Space Optimization icon

Free Space Optimization

Uses an efficient algorithm to examine portions of free space available on your hard drive and keep them at a single place to avoid fragmentation. This would in fact reduce the disk head movement and lead to a significant increase of your performance.

Impressive Color Legend for Free Space & Selected Files icon

Impressive Color Legend for Free Space & Selected Files

The software enables applying similar color scheme to memory blocks under similar category during the process. You can change the color scheme as per your suitability that would help to plan defragment of your Mac hard drive better.

Graphical View of the Drive Temperature icon

Graphical View of the Drive Temperature

The temperature of the drive selected for defragmentation can rise during the process. Now the software shows the temperature of the drive in a temperature scale so that you can take necessary steps when the temperature is about to cross the threshold level.

Defrag Mac Files icon

Defrag Mac Files

Collects logically related pieces of scattered data on your drive and allocates them neighboring or nearby locations to reduce fragmentation and make data access easier and smoother. You can either defrag a single file or perform defragmentation of multiple files simultaneously.

Full Defragmentation icon

Full Defragmentation

This defrag software accurately determines the space allocation on your hard drive and then smoothly defrags everything present on the drive, including files, metadata, and unused space. The software categorizes the disk space into various attributes, such as Allocation, Overflow, Catalog, Attribute, Fragmented, Data, and Unused Space.

Metadata Defragmentation icon

Metadata Defragmentation

The Mac Defrag software defrags all metadata files present in your system, including catalog, allocation, extent overflow, and attribute files. Metadata defragmentation paves the way for a much faster access to the file information.

Quick Defragmentation icon

Quick Defragmentation

The software accomplishes quick defragmentation by allowing you to defrag all fragmented files in your Mac volume. This eliminates the need for full defragmentation of the Mac hard drive or volume.

Bootable DVD icon

Bootable DVD

Enables you to create a bootable Mac DVD, which can be effectively used to boot your Mac machine and perform defragmentation of the boot volume of your system. If you are using 'Yosemite', you need to download the bootable image ('.dmg' file) and then burn it to a DVD to defrag the bootable partition.

Block-Level Representation of Hard Drive Volumes icon

Block-Level Representation of Hard Drive Volumes

The software displays the entire hard drive as a group of individual blocks in layout view. These blocks are colored by examining the extent of information of the associated drive area and usually represent three types of files, i.e. ‘fragmented files’, ‘normal files’, and ‘free space’. You can choose the color of blocks according to your preferences. You can also view the current temperature of your hard drive in the left pane.

Encrypted Volume(s) support icon

Encrypted Volume(s) support

This tool helps you to fully defrag and optimize password-protected Mac hard disk drives. The software will mount the encrypted hard drive once user unlocks it with the password. It will then let you choose any of the 4 algorithms (Quick, Full Metadata defrag and Optimize) in order to improve Mac hard drive’s performance.

Option to Send Email Notifications icon

Option to Send Email Notifications

The software allows sending email notifications after completion of the defragmentation task. You can select 'Preferences' on the 'StellarDriveDefrag' menu and specify the email ids to receive task completion notifications.

Option to View Path of File in a Block icon

Option to View Path of File in a Block

The software smartly displays the path of a file when you place the mouse cursor over a specific memory block. If you click on a particular block, the file occupying that block will be shown as highlighted in the 'Files' view. This feature enables you to quickly identify and trace all fragmented files on your hard drive.




The process of optimization arranges the files together at one place. Defragmentation takes different parts of the files into a single chunk of contiguous memory.


Yes, with Stellar Drive Defrag application, you can defrag any file you want. If you click on the 'File' tab, the software shows the individual files in the selected volume. Select the file from the list and defrag.


No, there is no such constraint regarding the make/model/type of hard drive. The software can defrag any Mac volume based internal, external, USB drive irrespective of its size or any other limitation.


Stellar Drive Defrag supports the latest Mac OS X 10.11 'El Capitan'. The software is also compatible with the earlier versions of OS X, including Mac OS X Yosemite 10.10, Mavericks 10.9, 10.8 'Mountain Lion', 10.7 'Lion' and 10.6 'Snow Leopard'.


Yes, the software can defrag/optimize the boot volume of your Mac system. However, for this, the software prompts to create a bootable DVD first. You can boot the system from this bootable DVD and defrag the boot volume. If you have 'Yosemite' installed on your computer, you need to download a bootable image ('.dmg' file) using the link provided by Stellar and then burn it to a DVD to defrag the boot volume of your system.


You can defrag a HFS or FAT formatted external hard drive using Stellar Drive Defrag utility. Learn more


Yes, the software can help you defrag the metadata files (catalog files, allocation files, attribute files, extent overflow etc.) of a system. You can use the 'Defrag Metadata' option to carry out this process.


No, Software does not support Power PC anymore.

Rating & Reviews


4.6 out of 5 stars


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User Comments



Before using this app, I had issues with my Mac OS hard drive due to slack space. But, once I used Stellar Drive Defrag app it removed all the slack space problem from my Mac and also proved helpful for improving my system performance significantly.



Optimised my 500 GB internal hard drive when no other apps could even come close to optimizing it.

Joseph Maultsby


My video library is huge and measures up to almost 450 GB of the hard drive storage. I work day around on video editors and my Mac runs on 16GB RAM and large 2 TB disk. Recently I began to notice sluggishness of my drive. My video editing became painfully slow and I realised that large files and bulky software are killing my Mac performance. I tuned up to this product which showed me the problem i.e. fragments. All of those files were badly fragmented and cannot be fixed without a defragger. This tool took great amount of time to fully defrag my HDD and removed all the fragments. With the restart I noticed the improvement of my Mac and with couple of more I witnessed a huge shift of performance hike.



Without a second thought I decided to optimize my iMac hard drive with Stellar Drive Defrag. OS X was lacking the responsiveness, goes into longer startup and gave me back spinning beach ball frequently. The demo version gave me an idea of the quantity of fragmented files occupying my iMac drive. Fragments were gigantic and could possible be removing only by formatting the disk. I tried Stellar Drive Defrag that gave me an option of creating bootable media through which I eradicated the fragments. As a result the boot time of the OS X improved, noticed better browsing and media players performance. The tool saved me from a hectic ordeal of backing up the Mac, formatting and reinstalling the OSX.



The best and fastest all around defragger and optimizer software for every Mac user.



I am a die hard fan of Stellar Drive Defrag utility since it boosted up my Mac disk running Mavericks 10.9.5. The UI is self explanatory and the software offerings to defrag Mac hard drive with four top algorithms is out of the box. I decided not to replace my hard drive after it was defragged and optimized by this amazing tool.

Elenora Mcnitt


Excellent tool to defrag encrypted file system. I revamped the performance of my 500GB external hard drive after enough of its sluggishness. No other defrag software offers this feature.



Had great success with Stellar Drive Defrag software after I booted up the Mac and kicked out those reddish blocks of fragments that were causing me a serious nightmare.



it takes hours of travelling from my house to the nearest Apple store. I needed to get my Mac back to work and your software just accomplished it for me. A big Thank You from Mexico.



I tried this piece of software on one my old iMac 2010 system that I was about to donate to my cousin. He wanted to start his learnings so I decided to optimize this iMac performance so that he is able to execute day to day tasks. To my surprise Stellar Drive Defrag improved it to a more than I expected and made this machine work better for a 5th grader.



This is one kick a** tool that surely outperform others and increasing your hard drive's performance.

Jeffrey Cook


I felt like throwing my Mac away after 4 years of its service since it begins to crawl almost everyday. Thanks to one of my friend who recommended me to optimize the Mac hard drive with Stellar Drive Defrag before deciding to let this Mac off. This software proved to be a savior and got back my Mac performance to an extent where I can use it for a year or more.

Michael A. Doucet


A nicely built application for those who believe in optimizing the hard drive before throwing it away. I had earlier used the Stellar Drive Defrag to optimize my PowerPC Mac. Sad that the support was discontinued but your software still maintains my Mac hard drive that runs on Intel processor.



I used to wonder why my Mac is slow with 4GB of RAM and 500 Gb of hard drive spaces. And that too when the disk is 10% empty. Ran couple of hardware test and found nothing. Reseted PRAM but didn't helped much. Accidentally installed Stellar Drive Defrag utility and to my shock found those filthy red blocks that have almost choked up my Mac disk. This red blocks (fragments) were the real cause of my Mac's suffering. I did some inquiry about the software in their technical department to which they ensure smooth refund if the software didn't perform as expected. I went ahead and purchased its full license and ran it on my system. After a couple of hours of running the tool I checked back and found no more red blocks and the disk looked healthier than before. With this outstanding performance I called Stellar to give my regards and congratulated them for having this tool.



Fast, reliable and secure application that gives users lots of choices on defragging a select hard drive. I love the option of defragging startup disk and eliminating metadata fragments thorough this masterpiece utility.


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