Mac os x diskimages helper

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Ask a question. Wireless Speciality level out of ten: 0. Notebooks Speciality level out of ten: 1. Answer: A: Answer: A: If you haven't already done so, reboot and see whether the problem goes away.

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Loading page content. In my previous life in Windows rebooting would be an obvious path, but now in the current Mac life I never thought about it until you mentioned it J All problems gone Reply Helpful Thread reply - more options Link to this Post. It is the first time I experience it, so I am quite curious Alternatively, hdiutil can be used to attach the image to the system as a device.

The pdisk utility can dump partition information from this disk just as in the case of a real disk.

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Note that a single device entry is listed when the image is attached there are no slices. As with disk-backed disk images, we can partition a RAM disk, create file systems on it, and so on. Mac OS X provides another mechanism, the BSD vnode disk driver, which allows files to be treated as disks by attaching them to specific "vn" device nodes. Although we will mostly use hdiutil to create disk images with automatically constructed partition layouts and file systems, it is instructive to look at an example that starts with a "blank disk.

So far, we have seen that attaching a disk image using hdiutil also mounts the volumes within the image. We can instruct hdiutil to only attach the image and not mount any volumes, thereby giving us block and character devices to use as we please.


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Since this disk has no partitions yet, nor even a partition scheme, pdisk will not display any partition information for it. We can initialize a partition map using pdisk. As we saw earlier, in the Apple partitioning scheme, a disk partition map entry is bytes in size. Our partition map occupies 63 blocks, each bytes.

Case: Mounting Mac DMG’s and the misterious post-exec diskimage-helper

Therefore, it has room for 63 map entries. Since the first entry is used for the partition map itself, we have room for as many as 62 new partition map entries, or 61, if the last entry is used for any trailing free space. Let us use, say, 31 of them [5] to create partitions, even though it is rather uncommon to actually need so many partitions.

The following shell script attempts to create 31 partitions, assigning 1MB of disk space to each.

macOS Error Opening .dmg Disk Image - No Mountable File Systems

Let us run the script with the name of our blank disk's raw device node as an argument. Note that pdisk prints the number of the map entry it uses while creating a partition. Detaching the disk will unmount all of them. Let us also look at an example of creating GUID-based partitions using the gpt command.

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