From time to time I’ve downloaded Mac OS X Disk Image files only to have the system display a cryptic warning that it failed to mount because it was “Not Recognized”. It’s happened several times when I tried to download the Intel Mac version of the excellent free 3D package Blender and I wrote it off as corrupted files.

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It happened again yesterday but this time today I bumped into this weblog posting by Unsanity that points at a server configuration issue as being the cause. Basically, the disk image is sent to Safari as a generic blob of data instead of being tagged as a disk image and Safari makes an (incorrect as it turns out) guess presumably based on the “bz” in the file name that the disk image was compressed using bzip2 after it was created and appends the extension .bz2 to the download when in fact the bz probably means the contents of the disk image use that compression method. OS X dutifully applied the bz2 decompression algorithm to the disk image data, strips off the extension and attempts to mount the resulting disk image which fails because it’s been thoroughly scrambled.

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Whether you are an avid Mac programmer using a Windows PC, or you just found a DMG file on your Windows machine, it can be useful to know what it is and how to open it. Luckily it’s easy to open on Windows if you know how. Jan 01, 2018  The term DMG is a file extension, which is abbreviated for Apple Disk Image. This type of disk image file is created in Apple machine having Macintosh operating system. The blog provides an overview of DMG file and different ways to open corrupted DMG file or Disk image file through a command line or a free application to view DMG contents in. Image not recognized' Does anybody have any suggestions for what might be causing this? I can't find anything on google, and I don't know much about Macs or even use a. XCode 7 beta 4 - dmg image not recognized. The following disk images couldn't be opened. Image: Xcode7beta4.dmg. Reason: image not recognized. Share improve this question. Edited Jul 22 '15 at 18:33. 1,072 2 15 30. Asked Jul 22 '15 at 18:09. Jmcmahon443 jmcmahon443.

Now many compression methods include internal checks (looking for specific tags or verifying a checksum) to make sure you are applying them to bone fide compressed data but it appears bzip2 doesn’t, or at least the OS X archive helper doesn’t use them.

Jul 22, 2015  XCode 7 beta 4 - dmg image not recognized 784 Views 3 Replies. 'The following disk images couldn't be opened. Image: Xcode7beta4.dmg. Reason: image not recognized.' Tags: xcode 7 beta 4. Content tagged with xcode 7 beta 4. Mac OS X - Disc Image Not Recognised. I tried it on two different computers and both had the same issue. I tried repairing it using Disk Utility but it didn't work. We've identified an issue with Cloudfront (our CDN) not caching the.dmg file which meant ALL requests for the.dmg are coming all the way back to the origin / source.

The proper fix is to let the provider of the file know about the problem, and point them at Unsanity’s post at http://www.unsanity.org/archives/macosx/mydmgisbwokenafter_download.php for details. The temporary workaround is to, when and only when you see the “not recognized” warning, remove the .bz2 extension from the original downloaded file leaving just the final .dmg then try opening file again in the Finder. If this was the cause of the problem the disk image will successfully verify and mount.

As to why only the Intel version of Blender had the problem, it turns out that the PowerPC version is served as a .zip with the correct MIME type rather than as a .dmg disk image.

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Thanks to the guys at Unsanity for the heads up on this one.