![]() ![]() If you remember the days of software that was provided on either a floppy or optical disc, disk images have been designed to work in much the same way but through digital, rather than physical, distribution.Ĭreating an image of a disk partition duplicates its entire structure into a single file, bit for bit. You'll likely have come across these when downloading apps, such as Skype, from the web. On the Mac, disk images tend to be DMG files. Disk Images ExplainedĪ disk image is a file containing the entire structure of a partition or even just a folder. It's an integral part of Disk Utility and, as with partitioning, creating & restoring images can be executed via the command-line. Disk imaging is a highly useful tool if you're wanting to create a whole copy of a volume and restore it back at a later date, either to the same disk or another one entirely.
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