• 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 Yosemite
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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 10.10 'Yosemite'. The software is also compatible with the earlier versions of OS X, including Mac OS X Mavericks 10.9, 10.8 'Mountain Lion', 10.7 'Lion', 10.6 'Snow Leopard' and earlier.


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.


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