Can SparseImage or SparseBundle be mounted in Windows?

Using standard Windows tools directly — usually not. Working with such images may require specialized tools that understand their structure and file system.

Can deleted files be recovered from DMG, SparseImage, or SparseBundle?

Yes, in some cases this is possible. If the data has not yet been physically overwritten, you can try to recover it using data recovery software. For damaged or non-standard images, the process may be more complex.

What to do if a DMG or SparseBundle is damaged and cannot be opened?

Do not attempt to restore the original file by performing multiple write operations. It is recommended to create a copy of the disk image first and then work with it. If this is a SparseBundle, it is important to preserve the entire directory structure and all of its segments.

Which format is best to use for backup?

The choice depends on the task. DMG is convenient as a universal image, SparseImage is suitable for images with a variable size, SparseBundle is intended for large images and backups, especially in network environments, and CDR is mainly used for creating optical disc images. For compatibility with Windows and Linux, it is also worth considering support for a specific format and file system.

Can a DMG file be opened in Windows?

Yes, but Windows does not support all DMG file types with built-in tools. To open or extract data, specialized applications that support the DMG format may be required.

Working with DMG, SparseImage, SparseBundle, and CDR Disk Images on Windows and Linux

Author:
Vladimir Artiukh
Editor:
Oleg Afonin
Updated: 13.08.2026 20:33

In macOS, disk images in the .dmg, .sparseimage, .sparsebundle, and .cdr formats are often used for file storage, backup, and data transfer. However, when such files are opened on Windows or Linux, many users have questions: how these formats differ, how to open them correctly, which options to use for mounting, and how to access the files inside the image.

Working with DMG, SparseImage, SparseBundle, and CDR Disk Images on Windows and Linux

Contents

DMG, SparseImage, SparseBundle, and CDR disk images are widely used in the macOS ecosystem for data storage, backup creation, file transfer, and copying physical media. Such images can contain both regular files and folders, as well as entire file systems with important information.

When working in Windows or Linux, access to these formats can be more difficult because they are not always supported by standard system tools. In addition, individual image types have their own structure and data storage characteristics that must be taken into account when opening, mounting, or restoring them.

In this article, we will look at what the DMG, SparseImage, SparseBundle, and CDR formats are, how they differ, and how to work with them in Windows and Linux. We will also examine ways to access the data, extract files, and work with images when they are damaged or do not open with standard tools.

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How to Open DMG, Sparseimage, Sparsebundle & CDR Images on Windows and Linux

Disk Images in macOS

Disk images in macOS are created using the built-in hdiutil utility, which is run through Terminal.

The most common formats are:

.dmg – standard macOS disk image.
.sparseimage – a dynamic image that grows as data is written.
.sparsebundle – an image composed of separate band segments.
.cdr – a CD or DVD image format.

Characteristic	DMG	SparseImage	SparseBundle	CDR
Full name	Disk Image	Sparse Disk Image	Sparse Bundle Disk Image	CD/DVD-ROM Image
Primary purpose	Storage and distribution of disk images, applications, and backups	Creating a disk image with a variable size	Storing a disk image as a set of small files	Creating an optical disc image
Typical extension	.dmg	.sparseimage	.sparsebundle	.cdr
Origin	Primarily macOS	macOS	macOS	macOS / Unix-like systems
File size	Can be fixed or compressed	Grows as data is written	Grows as the image is filled	Usually matches the size of data on the optical disc
Structure	Single image file	Single image file	Directory containing a set of segments	Single image file
Encryption support	Yes, depending on the image type	Yes	Yes	Depends on the creation method
Compression	Supported for relevant DMG types	May be used depending on the configuration	May be used depending on the configuration	Usually not used
Resize capability	Possible for certain image types	Automatically expands as needed	Automatically expands as needed	Size is usually fixed
Backup suitability	High	Convenient for local use	High, especially for network backups	Suitable for archiving CD/DVD images
Time Machine compatibility	Can be used depending on the macOS version and scenario	Used in earlier versions of Time Machine	Widely used by Time Machine for network backups	Not a primary Time Machine format
Use in Windows	Requires specialized software	Limited support, specialized tools required	Requires specialized software	Supported by many programs for ISO/CD image handling
Use in Linux	Appropriate utilities or conversion required	Specialized tools required	Specialized tools required	Supported by many disk image applications
Mounting	Possible after installing the appropriate software	Possible if format support is available	Possible if format support is available	Possible as an optical disc image
Main advantage	Versatility and wide use in the Apple ecosystem	Storage savings due to dynamic size	Convenient incremental copying and working with large images	Simple format for copying CD/DVD media
Main drawback	Not all DMG types are equally well supported by third-party operating systems	Can be difficult to work with outside macOS	Consists of a large number of files, which complicates manual copying	Limited by the capabilities of optical media
Typical use cases	macOS application installation, backups, distribution packages	Virtual disks and local images	Time Machine backups and network storage	Archiving and copying CD/DVD media

Features of DMG, SparseImage, SparseBundle, and CDR

The DMG format supports several compression types and image creation variants. The following main formats are used:

UDRO – a read-only image without compression.
UDRW – a writable image.
UDZO – zlib compression.
UDBZ – bzip2 compression.
ULFO – LZFSE compression.
ULMO – LZMA compression.
UDCO – an older ADC compression type.
UDTO – used to create CD or DVD images.
UDSP – format for creating dynamic sparseimage images.
UDSB – format for creating .sparsebundle images.

DMG: compression types and image creation variants

The most commonly used format is UDZO, because it allows the image size to be reduced without a significant loss in performance. Compressed images take up less space on disk, but may work slightly slower. Uncompressed images, by contrast, take up more space but provide faster access to data.

The .sparseimage and .sparsebundle formats are dynamic disk images that automatically expand as new data is added.

The .sparseimage format stores all data in a single file and allows more efficient use of free storage space.

The .sparsebundle format works similarly to .sparseimage, but stores data not in a single file, but as separate band segments. In other words, instead of one large file, a folder containing separate parts of the image is created. That is why .sparsebundle is often used for backups, data synchronization, network-based work, and in Time Machine.

.sparsebundle: stores data as separate band segments

The .cdr format is used to create CD and DVD images. Such images can be burned to disc or converted to the .iso format for further use in Windows and Linux.

STEP 1. How do you create an image?

Regardless of the image type, the creation process always starts in the same way. First, you need to determine the device number of the connected drive using the diskutil list command. In our case, it is /dev/disk3.

diskutil list

Before creating any image, the drive must be unmounted using the diskutil unmountDisk /dev/disk3 command, after which the image is created with the hdiutil create command.

diskutil unmountDisk /dev/disk3

hdiutil create

The same base command is used for all formats; only the image format parameter changes. For example, creating a classic uncompressed DMG image is performed with the command hdiutil create -srcdevice /dev/disk3 -format UDRO ~/Desktop/flash_drive.dmg.

hdiutil create -srcdevice /dev/disk3 -format UDRO ~/Desktop/flash_drive.dmg

STEP 2. How do you mount a disk image?

This is the stage where users most often get confused, because different image types must be mounted using different options.

First, let us look at the image mounting menu in Hetman Partition Recovery and determine which connection method is used for each format.

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Images in the .dmg format must be mounted through the “DMG Image” option. After connection, such an image will appear in the disk list as a separate drive.

Hetman Partition Recovery: .dmg is mounted through the DMG Image option

The .sparseimage file is mounted through the separate “Sparse Image” option. After opening, the image will also appear in the program as a separate disk.

Hetman Partition Recovery: .sparseimage is mounted through the Sparse Image option

The .sparsebundle format works differently because it is not a single file, but a folder containing band files. That is why it must be opened through the dedicated “Sparse Bundle” option.

Hetman Partition Recovery: .sparsebundle is mounted through the Sparse Bundle option

When connecting, you must select the .sparsebundle folder itself, not the individual band files inside it.

STEP 3. Viewing the image contents

Finally, let us review all mounted images in the disk list of Hetman Partition Recovery.

Hetman Partition Recovery: all mounted images

As you can see, all formats are displayed successfully after mounting and are identified by the program as separate drives. This allows the user to work with such images in the same way as with a regular physical disk: open partitions, browse files, and access the data inside the image.

Now double-click any mounted image. After opening it, the program will display the partitions, folders, and files contained within the image.

Hetman Partition Recovery: partitions, folders, and files inside the mounted image

The main point is that regardless of the image type, after correct mounting the user gets full access to their files and can work with them just as with a regular disk.

Now all that remains is to select the required files, click the “Recover” button, and save the data to another drive.

Hetman Partition Recovery: select files and click Recover

Important: do not save recovered files to the same storage device from which the data is being recovered.

Conclusion

DMG, SparseImage, SparseBundle, and CDR disk images are used for different tasks, but are most commonly found in the macOS ecosystem. DMG is the most versatile format for storing and distributing data, while SparseImage and SparseBundle are designed for variable-size images and backups. The CDR format is mainly used to create optical disc images.

When working with such images in Windows and Linux, it is important to consider that format support may differ from macOS. Not every image can be mounted directly with standard operating system tools, so specialized applications, command-line utilities, or prior conversion to a compatible format may be required.

If an image contains important data, it is recommended to create a backup copy before converting or restoring it and to work with the copy only. This is especially important for damaged DMG, SparseImage, or SparseBundle images, because careless operations may make further recovery more difficult.

Therefore, correct identification of the image type, understanding of its structure, and use of the appropriate tools make it possible to open, mount, convert, and recover DMG, SparseImage, SparseBundle, and CDR images in Windows and Linux more safely.