When using the APFS file system, this is more efficient (in Reserve a certain amount of space for the disk image’s use. This can be desirable, for example, if you want to When using the macOS Extended file system, this is lessĮfficient (in terms of space used) than a sparse disk imageīecause the file size is determined by the capacity of theĭisk image rather than by the amount of data currently stored The disk image is stored as a single file. With macOS 10.3 and later.dmg - constant file size Reclaim as much disk space as with sparse bundle disk images. The Compact Image… command generally does not Inefficient for large disk images, because the entire file must beĬopied each time. MacOS 10.5 and later.sparseimage - more efficient Sparse disk images are stored as a single file. Images work well with the Compact Image… command. To back them up using Time Machine or other backup utilities, as only Stored as a folder with many files inside. Image… command.sparsebundle - most efficient Sparse bundle disk images appear as a single file but are actually Read-write disk imagesĬan be created from existing files/folders or by using the New Blank Disk The contents of a read-write disk image can be directly accessed from theįinder, and you can add, remove, and modify files. Uncompressed disk image will generally be faster to create and access.Ĭompatible with macOS 10.2 and later. However, with certain types of content (music, photos, alreadyĬompressed files) the difference in size will be slight, and an Compatible with macOSġ0.4 and later, deprecated on macOS 12 and later.dmg - no compression An uncompressed disk image will always be larger than a compressed one. Stored, this can be significantly smaller than a zlib-compressed disk Compatible with macOS 10.15 and later.dmg bzip2 - smallest file, slowest A disk image compressed using bzip2. This is DropDMG’s recommendedįormat for when you need the most compression, if your files can The files are smaller than any of the other compression methods.Ĭompression takes slightly longer than bzip2, but decompression is Compatible with macOS 10.2 and later.dmg LZMA - smallest file, slower A disk image compressed using LZMA ( Lempel-Ziv-Markov chain algorithm). You can control the level of compression via ZlibLevel in the esoteric Use if your files need compatibility with macOS 10.10 or earlier.ĭropDMG creates smaller zlib-compressed disk images than Disk Utility. This is DropDMG’s recommended format for general The file is relatively compactĪnd quick to access.
General use if your files can require macOS 10.11 or later.Ĭompatible with macOS 10.11 and later.dmg zlib - smaller file, faster A disk image compressed using zlib. Slightly smaller than zlib-compressed disk images, with encoding that Mount Image… command and select the Shadow file option.dmg LZFSE - smaller file, fastest A disk image compressed using LZFSE ( Lempel–Ziv Finite State In order to search a read-only disk image via Spotlight, use the They have internal checksums for use with the Verify Image…Ĭommand. The contents of a read-only disk image can be directly accessed from theįinder, but they cannot be modified.
#Dropdmg for windows archive#
DropDMG supports the following disk image and archive formats: Read-only Mac Disk Image
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