FastDMG is a utility to mount.dmg and other disk images quickly, without any unneeded nonsense. It is a fast and reliable replacement for Apple's DiskImageMounter. Doesn't waste your precious time verifying disk images. FastDMG 'Replaces the system default DMG mounting application; is better in every way.' - Some Guy on the Internet. FastDMG is a free macOS utility to mount.dmg and other disk images quickly, without any unneeded nonsense. It is a very fast and reliable alternative to.

1. 21 votes, 29 comments. 63.2k members in the osx community. Reddit's community for users, developers, and hackers of Mac OS X – the desktop operating.
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3. FastDMG is a simple application created from a shell script using Platypus. It is a handler application for.dmg files which uses /usr/bin/hdid to mount the images without verification, auto-accepting any EULAs in the process. This application is faster than Apple's stock DiskImageMounter.

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DiskImageMounter is the utility that handles mounting disk volume images in Mac OS X, starting with version 10.3. DiskImageMounter works by either launching a daemon to handle the disk image or by contacting a running dæmon and have it mount the disk.

Like BOMArchiveHelper, DiskImageMounter has no GUI when double-clicked; doing so does nothing. The only GUI the program ever displays is a window with a progress bar and mount options (cancel or skip verification) or an error report if it could not mount the image. It is found in /System/Library/CoreServices/DiskImageMounter.app.

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Starting with version 10.7, Apple 'removed double-click support for images using legacy metadata.'^[1] DiskImageMounter will not be able to open .img (NDIF only), .smi (self mounting), .dc42 (Disk Copy 4.2), and .dart (DART) disk image formats that was previously supported in version 10.6 and earlier.

Image formats supported[edit]

DiskImageMounter supports a variety of disk image file types:^[2]

• Apple Disk Image (.dmg, com.apple.disk-image)
• UDIF disk images (.udif, com.apple.disk-image-udif); UDIF segment (.devs, .dmgpart, com.apple.disk-image-udif-segment)
• self mounting image^{[nb 1]} (.smi, com.apple.disk-image-smi)
• DVD/CD-R master image (.toast, .dvdr, .cdr, com.apple.disk-image-cdr, com.roxio.disk-image-toast)
• disk image segment (dmgpart)^[2]
• raw disk image (OSTypes: devr, hdrv, DDim, com.apple.disk-image-raw)
• PC drive container (OSTypes: OPCD, com.apple.disk-image-pc)
• ISO image (.iso, public.iso-image)
• sparse disk image (.sparseimage, com.apple.disk-image-sparse, .sparsebundle)

As of macOS 11.0, support for the following formats has been removed:

• Disk Copy 4.2 disk image^{[nb 1]} (.dc42, .diskcopy42, com.apple.disk-image-dc42)
• DART disk image^{[nb 1]} (.dart, com.apple.disk-image-dart)
• NDIF disk image^{[nb 1]} (.ndif, .img, com.apple.disk-image-ndif); NDIF disk image segment (.imgpart, com.apple.disk-image-ndif-segment)

Notes[edit]

1. ^ ^abcdMac OS Classic legacy disk image format supported by DiskImageMounter under Mac OS X versions 10.3—10.6^[1] As of version 10.9, hdiutil can still convert these formats but unable to open or write them, and version 11.0 removed all support.

References[edit]

1. ^ ^ab'hdiutil(1) Mac OS X Manual Page'. Apple Inc.Archived from the original on June 25, 2014. Retrieved September 3, 2014.
2. ^ ^ab/System/Library/CoreServices/DiskImageMounter.app/Contents/Info.plist

See also[edit]

• Disk Copy - this program's predecessor.
• hdiutil - command line tool counterpart that ships with macOS
• FastDMG - free alternative replacement for DiskImageMounter

Fastdmg

Fast Dng Processor