Once it has mounted, verify that it appears empty (apart from its hidden. Now double-click the disk image to mount it again. Once complete, unmount that disk image, select it in the Finder and Get Info.Īs expected, your disk image is a regular flat file, in this case of 100 GB and takes up 100 GB on disk. Open Disk Utility, and with its File/New Image/Blank Image… menu command create yourself an empty read/write disk image in APFS format of substantial size, anything between 5-100 GB.ĭisk Utility takes a few moments to create that, then automatically mounts it. What if I were to tell you that a UDRW disk image is really sparse storage that works more efficiently than regular sparse disk images (UDSP format) or sparse bundles (UDSB format)? All you need to know is how to unlock that potential. This can be desirable, for example if you want to reserve a certain amount of space for the disk image’s use.” This is less efficient than a sparse disk image because the file size is determined by the capacity of the disk image rather than by the amount of data currently stored on it. The disk image is stored as a single file. This is summarised well in C-Command’s documentation for DropDMG: “.dmg - constant file size. For example, if a USB device or volume is 80GB with 10GB of data, the disk image will be 80GB in size and include data and free space.” For instance, Apple states: “You can create a disk image that includes the data and free space on a physical disk or connected device, such as a USB device. Version reviewed: 2.Conventional wisdom, aided by the lengthy documentation for hdiutil and Apple’s help page for Disk Utility, is that regular read/write disk images (UDRW format) are of fixed size, and neither grow nor shrink. If you would like to use other disk image applications, you can also check these: DMGConverter, DMG Designs, DMG Packager, CreaDMG, Chop DMG, FreeDMG, or an archiver with DMG creation capabilities, CleanArchiver. The advanced features and the burning support that can be used for regular burning tasks are also very helpful. In conclusion: if you can get used to the minimal interface of this application, then the rest won't be a problem since the behavior during the tests was flawless. Pluses: it provides a decent image manipulation functionality, it has burning support, it has advanced mounting features, there's a possibility to preview the file information for your existing images, it can fix the broken images, it can verify the checksum of the images.ĭrawbacks / flaws: the interface of this application is a little unusable. ![]() DropDMG allows you to convert a graphic file into the. You can either burn a folder/file or you can burn an existing disk image. DropDMG also provides burning functionality. You can fix a broken image, get the image info, mount the image with owners, mount the image at a given location, or you can verify the image checksum. ![]() ![]() In the menus you can find functionality that's not typical for these kind of applications. The 'Preferences' panel allows you to save the configurations, so you can use a specific configuration for any image that you create, depending on the case. The disk image creation/conversion engine can do the same job as the freeware equivalent applications do. If you want more functionality, then you need to search for it in the menus. It has a small drop zone that can be used for the quick creation of the disk images, but the usable part ends here. The interface of this application is quite unusable. DropDMG is an utility that provides you with lot of disk image management functionalities.
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