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hdiutil

Access and repair a broken disk image

When trouble strikes a disk image, macOS normally refuses to accept and mount it. This details how to use hdiutil to attach the image as a device so it can be repaired by fsck_apfs.

March 25, 2026 Macs, Technology

Explainer: Disk images

They come in a multitude of formats and variants, and are used throughout macOS and apps. How do you use them, and what should be wary of?

March 21, 2026 Macs, Technology

Are sparse bundles faster than disk images?

Why does compressing a 15 GB file within a sparse bundle run more slowly than would be expected from its write performance?

December 16, 2024 Macs, Technology

Disk Images: Tools

Which are the best tools for the occasional user? For someone who creates disk images to distribute sofware? Or for hacking sparse bundles?

October 9, 2024 Macs, Technology

Serious bugs fixed in macOS Sonoma 14.3

Sparse bundle passwords, shared folders in macOS VMs, and security updates for VMs, are all important fixes. But none for the Finder.

January 24, 2024 Macs, Technology

What has changed in Sonoma 14.3?

The update to bring macOS Sonoma to version 14.3 isn’t large, although it has some compelling security content […]

January 22, 2024 Macs, Technology, Updates

Tips of the year: work around bugs and limitations

How to change the password for an encrypted sparse bundle, and how to use an ISO keyboard in a macOS VM on Apple silicon.

December 30, 2023 Macs, Technology

Serious bugs remain in macOS Sonoma 14.2

Two memory leaks in the Finder, inability to change password for encrypted sparse bundles, and a crashing bug in Contacts. Detailed and reported to Apple.

December 14, 2023 Macs, Technology

Spundle 1.8 adds support for Case-sensitive APFS sparse bundles

T T Read More

New version creates and maintains Case-sensitive APFS sparse bundles in addition to its previous range of formats.

December 4, 2023 Macs, Technology, Updates

Common catches in Sparse Bundles and Disk Images

Why macOS may refuse to give you a very large sparse bundle, how you can’t change the password of encrypted sparse bundles, and more.

November 30, 2023 Macs, Technology

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