A .dmg file is a disk image, meaning it's an exact copy (raw block DATA) of a disk (CD, DVD, USB stick, etc..) or even just a folder wrapped in a disk image. DMG images have been the default file format for distributing software on the internet for Mac OS X users since the year 2000. DMG images are safe to store on any partition type, such as Windows (NTFS) and are safe to distribute over FTP, send by email, etc.. as opposed to the previous default Mac OS disk image format DiskCopy which totally unsafe to copy over anything else than a HFS (Mac) partition. DiskCopy allowed for compression, which is still the case for DMG images but the latter also allows for encryption.. which proves to be a double-sided sword when comes to universal support, especially under Mac OS 9. That is precisely why you should consider making CDR images instead to preserve Mac OS 9 and earlier disk images.
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A file format like.DMG Apple Mac Os X Disk Image is a standard way that information is encoded for storage in a computer file. The.DMG Apple Mac Os X Disk Image format specifies how bits are used to encode information in a digital storage medium. File formats may be either proprietary or free and may be either unpublished or open. A DMG disk image file is Apple's container format for capturing entire drives or disks, similar to ISO for other platforms like Windows. It consists of data blocks that represent a physical disc. If you're on a Windows machine, you're limited in what you can do with DMG files. A file with the DMG file extension is an Apple Disk Image file, or sometimes called a Mac OS X Disk Image file, which is basically a digital reconstruction of a physical disc. For this reason, a DMG is often the file format used to store compressed software installers instead of having to use a physical disc.
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